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{{short description|German polymath (1769–1859)}}
{{Other uses}}
{{Use dmy dates|date=September 2021}}
{{EngvarB|date=September 2021}}
{{Infobox scientist
| name              = Alexander von Humboldt
| image             = Stieler, Joseph Karl - Alexander von Humboldt - 1843.jpg
| caption           = Portrait by [[Joseph Karl Stieler]] (1843)
| birth_name        = Friedrich Wilhelm Heinrich Alexander von Humboldt
| birth_date        = {{Birth date|1769|9|14|df=yes}}
| birth_place       = Berlin, Prussia
| death_date        = {{Death date and age|1859|5|6|1769|9|14|df=yes}}
| death_place       = Berlin, Prussia
| resting_place     = [[Schloss Tegel]]
| education         = [[Viadrina European University|University of Frankfurt (Oder)]]<br/>[[University of Göttingen]]<br/>[[Freiberg University of Mining and Technology|Freiberg School of Mines]] ([[diploma]], 1792)
| field             = [[Geography]]
| known_for         = [[Biogeography]], ''[[Kosmos (Humboldt)|Kosmos]]'' (1845–1862), [[Humboldt Current]], [[magnetic storm]], [[Humboldtian science]], [[Berlin Romanticism]]<ref>Helmut Thielicke, ''Modern Faith and Thought'', William B. Eerdmans Publishing, 1990, p. 174.</ref>
| academic_advisors = [[Markus Herz]], [[Georg Christoph Lichtenberg]], [[Carl Ludwig Willdenow]], [[Abraham Gottlob Werner]]
| notable_students =
| prizes            = [[Copley Medal]] (1852)
| signature         = Alexander von Humboldt signature.svg
}}

'''Friedrich Wilhelm Heinrich Alexander von Humboldt'''{{efn|{{IPAc-en|ˈ|h|ʌ|m|b|oʊ|l|t}},<ref>{{cite web|url=https://www.collinsdictionary.com/dictionary/english/humboldt|title=Humboldt|work=[[Collins English Dictionary]]|publisher=[[HarperCollins]]|access-date=11 July 2019}}</ref> <small>also</small> {{IPAc-en|US|ˈ|h|ʊ|m|b|oʊ|l|t}},<ref>{{Cite Merriam-Webster|Humboldt|access-date=11 July 2019}}</ref> {{IPAc-en|UK|ˈ|h|ʌ|m|b|ɒ|l|t}};<ref>{{Cite dictionary |url=http://www.lexico.com/definition/Humboldt,+Alexander+von |archive-url=https://web.archive.org/web/20210512144325/https://www.lexico.com/definition/humboldt,_alexander_von |url-status=dead |archive-date=2021-05-12 |title=Humboldt, Alexander von |dictionary=[[Lexico]] UK English Dictionary |publisher=[[Oxford University Press]]}}</ref> {{IPA|de|ˌalɛˈksandɐ fɔn ˈhʊmbɔlt|lang}}}} (14 September 1769 – 6 May 1859) was a German [[polymath]], [[geographer]], [[natural history|naturalist]], [[List of explorers|explorer]], and proponent of [[Romanticism|Romantic]] philosophy and [[Romanticism in science|science]].<ref>Malcolm Nicolson, "Alexander von Humboldt and the Geography of Vegetation", in: A. Cunningham and N. Jardine (eds.), ''Romanticism and the Sciences'', Cambridge University Press, 1990, pp. 169–188; Michael Dettelbach, "Romanticism and Resistance: Humboldt and "German" Natural Philosophy in Natural Philosophy in Napoleonic France", in: Robert M. Brain, Robert S. Cohen, Ole Knudsen (eds.), ''Hans Christian Ørsted and the Romantic Legacy in Science: Ideas, Disciplines, Practices'', Springer, 2007; Maurizio Esposito, ''Romantic Biology, 1890–1945'', Routledge, 2015, p. 31.</ref> He was the younger brother of the Prussian minister, philosopher, and [[linguistics|linguist]] [[Wilhelm von Humboldt]] (1767–1835).<ref>{{cite news|title=''The Invention of Nature'', by Andrea Wulf|date=25 September 2015|newspaper=[[The New York Times]]|first=Colin|last=Thubron|author-link=Colin Thubron|url=https://www.nytimes.com/2015/09/27/books/review/the-invention-of-nature-by-andrea-wulf.html|access-date=1 March 2017|archive-date=17 October 2016|archive-url=https://web.archive.org/web/20161017183940/http://www.nytimes.com/2015/09/27/books/review/the-invention-of-nature-by-andrea-wulf.html|url-status=live}}</ref><ref>{{cite web |year=2014 |title=Von Humboldt, Alexander |first=Jeffrey |last=Lee |website=The Encyclopedia of Earth |url=http://www.eoearth.org/view/article/156871/ |access-date=2015-09-26 |archive-date=2015-09-27 |archive-url=https://web.archive.org/web/20150927171502/http://www.eoearth.org/view/article/156871/ |url-status=live }}</ref><ref>{{cite news |journal=[[Science (journal)|Science]] |title=Alexander von Humboldt and the General Physics of the Earth |first=Stephen T. |last=Jackson |volume=324 |pages=596–597 |url=http://faculty.jsd.claremont.edu/dmcfarlane/bio176mcfarlane/pdf%20papers/Humboldt%20hsitory.pdf |access-date=2015-11-11 |archive-date=2019-04-12 |archive-url=https://web.archive.org/web/20190412023559/http://faculty.jsd.claremont.edu/dmcfarlane/bio176mcfarlane/pdf%20papers/Humboldt%20hsitory.pdf |url-status=live }}</ref> Humboldt's quantitative work on [[botany|botanical]] [[geography]] laid the foundation for the field of [[biogeography]], while his advocacy of long-term systematic geophysical measurement pioneered modern [[Earth's magnetic field|geomagnetic]] and [[meteorology|meteorological]] monitoring.<ref>{{Cite journal|last=Love|first=J.J.|title=Magnetic monitoring of Earth and space|journal=Physics Today|volume=February|issue=2|year=2008|pages=31–37|url=http://www.intermagnet.org/publications/Magnetic_monitoring_of_earth_and_space.pdf|access-date=29 June 2015|doi=10.1063/1.2883907|bibcode=2008PhT....61b..31H|archive-date=28 July 2019|archive-url=https://web.archive.org/web/20190728141158/http://www.intermagnet.org/publications/Magnetic_monitoring_of_earth_and_space.pdf|url-status=live}}</ref><ref>{{citation|last=Thomson|first=A.|title=Von Humboldt and the establishment of geomagnetic observatories|journal=IAEA-Inis|year=2009|url=http://inis.iaea.org/search/searchsinglerecord.aspx?recordsFor=SingleRecord&RN=41118488|access-date=2015-03-08|archive-date=2020-03-04|archive-url=https://web.archive.org/web/20200304143542/https://inis.iaea.org/search/searchsinglerecord.aspx?recordsFor=SingleRecord&RN=41118488|url-status=live}}</ref> Humboldt and [[Carl Ritter]] are both regarded as the founders of modern geography as they established it as an independent scientific discipline.<ref>{{Cite journal |last=Hartshorne |first=Richard |author-link=Richard Hartshorne |date=1939 |title=The pre-classical period of modern geography |url=https://www.tandfonline.com/doi/abs/10.1080/00045603909357282 |journal=Annals of the Association of American Geographers |volume=29 |issue=3 |pages=35–48 |doi=10.1080/00045603909357282 |via=Taylor & Francis|url-access=subscription }}</ref><ref>{{Cite book |last=Kerski |first=Joseph J. |author-link=Joseph Kerski |title=Interpreting Our World: 100 Discoveries That Revolutionized Geography |publisher=ABC-Clio |year=2016 |isbn=9781610699204 |pages=284}}</ref>

Between 1799 and 1804, Humboldt travelled extensively in the [[Americas]], exploring and describing them for the first time from a non-Spanish European scientific point of view. On these travels, along with French explorer [[Aimé Bonpland]], he traversed thousands of miles through some of the most difficult and little-known places on Earth, to include identifying the source of the [[Orinoco|Orinoco River]] and in 1802 climbing the highest mountain in Ecuador to a height of 19,286 feet, at the time a world record altitude for a Westerner.<ref name="McC"/> His description of the journey was written up and published in several volumes over 21 years.

Humboldt resurrected the use of the word ''cosmos'' from the ancient Greek and assigned it to his multivolume treatise, ''[[Cosmos (Humboldt book)|Kosmos]]'', in which he sought to unify diverse branches of scientific knowledge and culture. This important work also motivated a holistic perception of the universe as one interacting entity,<ref name="Walls 2009 3–15">{{Cite journal|last=Walls|first=L.D.|title=Introducing Humboldt's Cosmos|journal=Minding Nature|volume=August 2009|pages=3–15|url=http://www.humansandnature.org/introducing-humboldt-s-cosmos-article-26.php|access-date=2015-03-04|archive-date=2019-05-12|archive-url=https://web.archive.org/web/20190512163431/https://www.humansandnature.org/introducing-humboldt-s-cosmos-article-26.php|url-status=live}}</ref> which introduced concepts of [[ecology]] leading to ideas of [[environmentalism]]. In 1800, and again in 1831, he described scientifically, on the basis of observations generated during his travels, local impacts of development causing [[Climate change|human-induced climate change]].<ref name="Paul-2017" /><ref>{{Cite web|url=https://www.theatlantic.com/science/archive/2015/12/the-forgotten-father-of-environmentalism/421434/|title=The Forgotten Father of Environmentalism|last=Wulf|first=Andrea|author-link=Andrea Wulf|date=2015-12-23|work=[[The Atlantic]]|access-date=2020-01-14|ref=none|archive-date=2020-01-14|archive-url=https://web.archive.org/web/20200114203439/https://www.theatlantic.com/science/archive/2015/12/the-forgotten-father-of-environmentalism/421434/|url-status=live}}</ref><ref>{{Cite journal|date=2019-08-29|title=Humboldt's legacy|journal=Nature Ecology & Evolution|language=en|volume=3|issue=9|pages=1265–1266|doi=10.1038/s41559-019-0980-5|pmid=31467435|issn=2397-334X|doi-access=free|bibcode=2019NatEE...3.1265. }}</ref>

Humboldt is seen as "the father of ecology" and "the father of environmentalism".<ref>{{cite web | url=https://biology4095.science.blog/2020/02/19/the-father-of-ecology/ | title=The Father of Ecology | date=19 February 2020 }}</ref><ref>{{cite web | url=https://www.theatlantic.com/science/archive/2015/12/the-forgotten-father-of-environmentalism/421434/ | title=The Forgotten Father of Environmentalism | website=[[The Atlantic]] | date=23 December 2015 }}</ref>

==Early life, family and education==
Alexander von Humboldt was born in Berlin in [[Prussia]] on 14 September 1769.<ref name="Klencke-1853">{{cite book |first1=Hermann |last1=Klencke |first2=Gustav |last2=Schlesier |title=Lives of the brothers Humboldt, Alexander and William |location=New York |year=1853 |page=[https://archive.org/details/livesofbrothersh00klen/page/n19 13]}}</ref> He was baptized as a baby in the Lutheran faith, with the [[Charles I, Duke of Brunswick-Wolfenbüttel|Duke of Brunswick-Wolfenbüttel]] serving as godfather.{{sfn|de Terra|1955|p=3}}

His father, Alexander Georg von Humboldt (1720-1779), belonged to a prominent [[German nobility|German noble family]] from [[Pomerania]]. Although not one of the titled gentry, he was a major in the [[Prussian Army]], who had served with the [[Charles William Ferdinand, Duke of Brunswick|Duke of Brunswick]].{{sfn|de Terra|1955|pp=4–5}} At age 42, Alexander Georg was rewarded for his services in the [[Seven Years' War]] with the post of royal [[Chamberlain (office)|chamberlain]].<ref name="EB1911">{{cite EB1911| wstitle=Humboldt, Friedrich Heinrich Alexander von |volume=13 |pages= 873–875 |first=Agnes Mary |last=Clerke |author-link=Agnes Mary Clerke}}</ref> He profited from the contract to lease state lotteries and tobacco sales.{{sfn|de Terra|1955|p=5}} 

Alexander's grandfather was Johann Paul von Humboldt (1684-1740), who married Sophia Dorothea von Schweder (1688-1749), daughter of Prussian General Adjutant Michael von Schweder (1663-1729).<ref name="Klencke-1853"/><ref>{{cite web | url=http://www.von-humboldt.de/michael-von-schweder.html | title=Michael von Schweder (10) und Elisabeth Blomenfelt, gen. Persdotter (11) - von-Humboldt_de }}</ref> In 1766, his father, Alexander Georg married [[Marie-Elisabeth von Humboldt|Maria Elisabeth Colomb]], a well-educated woman and widow of Baron Friedrich Ernst von Holwede (1723-1765), with whom she had a son Heinrich Friedrich Ludwig (1762-1817). Alexander Georg and Maria Elisabeth had four children: two daughters, Karoline and Gabriele, who died young, and then two sons, Wilhelm and Alexander. Her first-born son, Wilhelm and Alexander's half-brother, [[Rittmaster]] in the [[Gendarme (historical)|Gendarme regiment]] was something of a [[ne'er-do-well]], not often mentioned in the family history.{{sfn|de Terra|1955|pp=6–7}}

Alexander Georg died in 1779, leaving the brothers Humboldt in the care of their emotionally distant mother. She had high ambitions for Alexander and his older brother Wilhelm, hiring excellent tutors, who were [[Age of Enlightenment|Enlightenment]] thinkers, including Kantian physician [[Marcus Herz]] and botanist [[Carl Ludwig Willdenow]], who became one of the most important botanists in Germany.{{sfn|Nicolson|Wilson|1995|p=xvi}} Humboldt's mother expected them to become civil servants of the Prussian state.{{sfn|Wulf|2015|pp=13, 17}} The money left to Alexander's mother by Baron Holwede became instrumental in funding Alexander's explorations after her death; contributing more than 70% of his private income.

[[File:Schloss Tegel1.JPG|thumb|263px|[[Schloss Tegel]], Berlin, where Alexander and his brother [[Wilhelm von Humboldt|Wilhelm]] lived for several years]]
Due to his youthful penchant for collecting and labeling plants, shells, and insects, Alexander received the playful title of "the little apothecary".<ref name="EB1911"/> Marked for a political career, Alexander studied [[finance]] for six months in 1787 at the [[Viadrina European University|University of Frankfurt (Oder)]], which his mother might have chosen less for its academic excellence than its closeness to their home in Berlin.{{sfn|Wulf|2015|p=17}} On 25 April 1789, he matriculated at the [[University of Göttingen]], then known for the lectures of [[Christian Gottlob Heyne|C. G. Heyne]] and anatomist [[Johann Friedrich Blumenbach|J. F. Blumenbach]].{{sfn|Nicolson|Wilson|1995|p=xvi}} His brother Wilhelm was already a student at Göttingen, but they did not interact much, since their intellectual interests were quite different.{{sfn|Wulf|2015|p=18}} His vast and varied interests were by this time fully developed.<ref name="EB1911"/>

At the University of Göttingen, Humboldt met Steven Jan van Geuns, a Dutch medical student, with whom he travelled to the [[Rhine]] in the fall of 1789. In Mainz, they met [[Georg Forster]], a naturalist who had been with Captain [[James Cook]] on his second voyage.{{sfn|Nicolson|Wilson|1995|pp=xvi–xv}} Humboldt's scientific excursion resulted in his 1790 treatise ''[[Mineralogische Beobachtungen über einige Basalte am Rhein]]'' (Brunswick, 1790) (''Mineralogic Observations on Several Basalts on the River Rhine'').{{sfn|Daum|2024a|pages=19–22}} The following year, 1790, Humboldt returned to Mainz to embark with Forster on a journey to England, Humboldt's first sea voyage, the Netherlands, and France.{{sfn|Wulf|2015|p=18}}{{sfn|Nicolson|Wilson|1995|p=xv}} In England, he met Sir [[Joseph Banks]], president of the [[Royal Society]], who had travelled with Captain Cook; Banks showed Humboldt his huge [[herbarium]], with specimens of the South Sea tropics.{{sfn|Nicolson|Wilson|1995|p=xv}} The scientific friendship between Banks and Humboldt lasted until Banks's death in 1820, and the two shared botanical specimens for study. Banks also mobilized his scientific contacts in later years to aid Humboldt's work.{{sfn|Wulf|2015|pp=76, 136}} In Paris, Humboldt and Forster witnessed the preparations for the [[Fête de la Fédération|Festival of the Federation]]. Yet, Humboldt's take on the French Revolution remained ambivalent.{{sfn |Daum |2025 |p= }}{{page needed |date=June 2025}}

Humboldt's passion for travel was of long standing. He devoted to prepare himself as a scientific explorer. With this emphasis, he studied commerce and foreign languages at [[Hamburg]], geology at [[Freiberg University of Mining and Technology|Freiberg School of Mines]] in 1791 under [[Abraham Gottlob Werner|A.G. Werner]], leader of the [[Neptunist]] school of geology;{{sfn|Nicolson|Wilson|1995|p=lxvii}} from anatomy at [[University of Jena|Jena]] under [[Justus Christian Loder|J.C. Loder]]; and astronomy and the use of scientific instruments under [[Franz Xaver von Zach|F.X. von Zach]] and [[Johann Gottfried Koehler|J.G. Köhler]].<ref name="EB1911"/> At Freiberg, he met a number of men who were to prove important to him in his later career, including Spaniard Manuel del Río, who became director of the School of Mines the crown established in Mexico; [[Christian Leopold von Buch]], who became a regional geologist; and, most importantly, {{ill|Johann Carl Freiesleben|de|lt=Carl Freiesleben}}, who became Humboldt's tutor and close friend. During this period, his brother Wilhelm married, but Alexander did not attend the nuptials.{{sfn|de Terra|1955|p=51}}

==Travels and work in Europe==
Humboldt graduated from the Freiberg School of Mines in 1792 and was appointed to a [[Principality of Bayreuth#Younger line|Prussian government]] position in the Department of Mines as an inspector in [[Bayreuth]] and the [[Fichtel Mountains]]. Humboldt was excellent at his job, with production of gold ore in his first year outstripping the previous eight years.{{sfn|de Terra|1955|p=53}} During his period as a mine inspector, Humboldt demonstrated his deep concern for the men laboring in the mines. He opened a free school for miners, paid for out of his own pocket, which became an unchartered government training school for labor. He also sought to establish an emergency relief fund for miners, aiding them following accidents.{{sfn|de Terra|1955|pp=54–55}}

Humboldt's researches into the vegetation of the mines of [[Freiberg]] led to the publication in Latin (1793) of his ''Florae Fribergensis, accedunt Aphorismi ex Doctrina, Physiologiae Chemicae Plantarum'', which was a compendium of his botanical researches.{{sfn|Nicolson|Wilson|1995|p=lxvii}} That publication brought him to the attention of [[Johann Wolfgang von Goethe]], who had met Humboldt at the family home when Alexander was a boy, but Goethe was now interested in meeting the young scientist to discuss metamorphism of plants.{{sfn|de Terra|1955|pp=18, 57}} An introduction was arranged by Humboldt's brother, who lived in the university town of Jena, not far from Goethe. Goethe had developed his own extensive theories on comparative anatomy. Working before Darwin, he believed that animals had an internal force, an ''urform'', that gave them a basic shape and then they were further adapted to their environment by an external force. Humboldt urged him to publish his theories. Together, the two discussed and expanded these ideas. Goethe and Humboldt soon became close friends.

Humboldt often returned to Jena in the years that followed. Goethe remarked about Humboldt to friends that he had never met anyone so versatile. Humboldt's drive served as an inspiration for Goethe. In 1797, Humboldt returned to Jena for three months. During this time, Goethe moved from his residence in Weimar to reside in Jena. Together, Humboldt and Goethe attended university lectures on anatomy and conducted their own experiments. One experiment involved hooking up a frog leg to various metals. They found no effect until the moisture of Humboldt's breath triggered a reaction that caused the frog leg to leap off the table. Humboldt described this as one of his favorite experiments because it was as if he were "breathing life into" the leg.{{sfn|Wulf|2015|p={{page needed|date=May 2021}}}}

During this visit, a thunderstorm killed a farmer and his wife. Humboldt obtained their corpses and analyzed them in the anatomy tower of the university.{{sfn|Wulf|2015}}

[[File:Weimarer Klassik.jpg|thumb|Schiller, Wilhelm, and Alexander von Humboldt with Goethe in [[Jena]]]]
In 1794, Humboldt was admitted to the famous group of intellectuals and cultural leaders of [[Weimar Classicism]]. Goethe and [[Friedrich Schiller|Schiller]] were the key figures at the time. Humboldt contributed (7 June 1795) to Schiller's new periodical, ''Die Horen'', a philosophical [[allegory]] entitled {{lang|de|Die Lebenskraft, oder der rhodische Genius}} ''(The Life Force, or the Rhodian Genius).''<ref name="EB1911"/> In this short piece, the only literary story Humboldt ever authored, he tried to summarize the often contradictory results of the thousands of Galvanic experiments he had undertaken.{{sfn|Daum|2019}}

In 1792 and 1797, Humboldt was in [[Vienna]]; in 1795 he made a geological and botanical tour through Switzerland and Italy. Although this service to the state was regarded by him as only an apprenticeship to the service of science, he fulfilled its duties with such conspicuous ability that not only did he rise rapidly to the highest post in his department, but he was also entrusted with several important diplomatic missions.<ref name="EB1911"/>

Neither brother attended the funeral of their mother on 19 November 1796.{{sfn|Wulf|2015|p=39}} Humboldt had not hidden his aversion to his mother, with one correspondent writing of him after her death, "her death... must be particularly welcomed by you".<ref>Carl Freiesleben quoted in {{harvnb|Wulf|2015|p=39}}.</ref> After severing his official connections, he awaited an opportunity to fulfill his long-cherished dream of travel.

Humboldt was able to spend more time on writing up his research. He had used his own body for experimentation on muscular irritability, recently discovered by [[Luigi Galvani]] and published his results, {{lang|de|Versuche über die gereizte Muskel- und Nervenfaser}} (Berlin, 1797) (''Experiments on Stimulated Muscle and Nerve Fibres''), enriched in the French translation with notes by Blumenbach.

==Spanish American expedition, 1799–1804==
[[File:Map Alexander von Humboldt expedition-en.svg|thumb|upright=1.3|Alexander von Humboldt's Latin American expedition]]{{Main|American Expedition 1799-1804}}

===Seeking a foreign expedition===
With the financial resources to fund his scientific travels, he sought a ship on a major expedition. In the meantime, he went to Paris, where his brother Wilhelm was living. Paris was a great center of scientific learning and his brother and sister-in-law Caroline were well connected in those circles. [[Louis-Antoine de Bougainville]] urged Humboldt to accompany him on a major expedition, likely to last five years, but the French revolutionary [[Directoire]] placed [[Nicolas Baudin]] at the head of it rather than the aging scientific traveler.{{sfn|de Terra|1955|p=80}} On the postponement of Captain Baudin's proposed voyage of [[circumnavigation]] due to continuing warfare in Europe, which Humboldt had been officially invited to accompany, Humboldt was deeply disappointed. He had already selected scientific instruments for his voyage. He did, however, have a stroke of luck with meeting [[Aimé Bonpland]], the botanist and physician for the voyage.

Discouraged, the two left Paris for [[Marseille]], where they hoped to join [[Napoleon I of France|Napoleon Bonaparte]] in Egypt, but North Africans were in revolt against the French invasion in Egypt and French authorities refused permission to travel. Humboldt and Bonpland eventually found their way to [[Madrid]], where their luck changed spectacularly.{{sfn|de Terra|1955|p=83}}

===Spanish royal authorization, 1799===
In Madrid, Humboldt sought authorization to travel to Spain's realms in the Americas; he was aided in obtaining it by the German representative of Saxony at the royal Bourbon court. Baron Forell had an interest in mineralogy and science endeavors and was inclined to help Humboldt.{{sfn|de Terra|1955|p=83}} At that time, the [[Bourbon Reforms]] sought to reform administration of the realms and revitalize their economies.<ref>[[Ida Altman]], Sarah Cline, Javier Pescador, ''The Early History of Greater Mexico''. Prentice Hall, 2003, pp. 300–317.</ref> At the same time, the [[Spanish Enlightenment]] was in florescence. For Humboldt "the confluent effect of the Bourbon revolution in government and the Spanish Enlightenment had created ideal conditions for his venture".{{sfn|Brading|1991|p=517}}

The Bourbon monarchy had already authorized and funded expeditions, with the [[Botanical Expedition to the Viceroyalty of Peru]] to Chile and Peru (1777–88), New Granada (1783–1816), New Spain (Mexico) (1787–1803), and the [[Malaspina Expedition]] (1789–94). These were lengthy, state-sponsored enterprises to gather information about plants and animals from the Spanish realms, assess economic possibilities, and provide plants and seeds for the Royal Botanical Garden in Madrid (founded 1755).{{sfn|Bleichmar|2012|p=5}} These expeditions took naturalists and artists, who created visual images as well as careful written observations as well as collecting seeds and plants themselves.{{sfn|Bleichmar|2012|p=19}} Crown officials as early as 1779 issued and systematically distributed ''Instructions concerning the most secure and economic means to transport live plants by land and sea from the most distant countries'', with illustrations, including one for the crates to transport seeds and plants.<ref>Casimiro Gómez Ortega, ''Instrucción sobre el modo más seguro y económico de transportar plantas vivas por mar y tierra a los países más distantes ilustrada con láminas. Añadese el método de desacar las plants para formar herbarios'' (Madrid 1779). Biblioteca del Real Jardín Botánico, Madrid, cited in {{harvnb|Bleichmar|2012|pp=26–27}}.</ref>

When Humboldt requested authorization from the crown to travel to Spanish America, most importantly, with his own financing, it was given positive response. Spain under the Habsburg monarchy had guarded its realms against foreigner travelers and intruders. The Bourbon monarch was open to Humboldt's proposal. Spanish Foreign Minister Don [[Mariano Luis de Urquijo]] received the formal proposal and Humboldt was presented to the monarch in March 1799.{{sfn|de Terra|1955|p=83}} Humboldt was granted access to crown officials and written documentation on Spain's empire. With Humboldt's experience working for the absolutist Prussian monarchy as a government mining official, Humboldt had both the academic training and experience of working well within a bureaucratic structure.{{sfn|Brading|1991|p=517}}
[[File:Alexander von Humboldt by Friedrich Georg Weitsch.jpg|thumb|upright=1.1|Portrait of Alexander von Humboldt by [[Friedrich Georg Weitsch]], 1806]]

Before leaving Madrid in 1799, Humboldt and Bonpland visited the [[Museo Nacional de Ciencias Naturales|Natural History Museum]], which held results of [[Martín Sessé y Lacasta]] and [[José Mariano Mociño]]'s botanical expedition to [[New Spain]].<ref>Stephen T. Jackson, "Biographical Sketches" in ''Essay on the Geography of Plants'' by Alexander von Humboldt and Aimé Bonpland. Edited by Stephen T. Jackson, translated by Sylvie Romanowski. Chicago: University of Chicago Press 2009, p. 248.</ref> Humboldt and Bonpland met [[Hipólito Ruiz López]] and [[José Antonio Pavón y Jiménez]] of the royal expedition to Peru and Chile in person in Madrid and examined their botanical collections.<ref>Jackson, "Biographical Sketches" pp. 245, 246–247.</ref>

===Venezuela, 1799–1800===
[[File:Humboldt and Bonplant in the Jungle.jpg|thumb|Humboldt and [[Aimé Bonpland]] were in the Amazon rainforest by the [[Casiquiare River]]. Oil painting by [[Eduard Ender]], 1856. Humboldt did not like the painting as the instruments depicted were inaccurate.<ref>Andrea Wulf (2015). The invention of nature, the adventures of Alexander von Humboldt, the lost hero of science</ref>]]
[[Image:Canal do Cassiquiare.jpg|thumb|upright=1.2|Map of the [[Casiquiare canal]] based on Humboldt's 1799 observations]]
Armed with authorization from the King of Spain, Humboldt and Bonpland made haste to sail, taking the ship ''Pizarro'' from [[La Coruña]], on 5 June 1799. The ship stopped six days on the island of [[Tenerife]], where Humboldt climbed the volcano [[Teide]], and then sailed on to the New World, landing at [[Cumaná]], [[Venezuela]], on 16 July.

The ship's destination was not originally Cumaná, but an outbreak of typhoid on board meant that the captain changed course from [[Havana]] to land in northern South America. Humboldt had not mapped out a specific plan of exploration, so that the change did not upend a fixed itinerary. He later wrote that the diversion to Venezuela made possible his explorations along the Orinoco River to the border of Portuguese Brazil. With the diversion, the ''Pizarro'' encountered two large dugout canoes each carrying 18 Guayaqui Indians. The ''Pizarro''{{'}}s captain accepted the offer of one of them to serve as pilot. Humboldt hired this Indian, named Carlos del Pino, as a guide.{{sfn|de Terra|1955|pp=91–92}}

Venezuela from the 16th to the 18th centuries was a relative backwater compared to the seats of the Spanish viceroyalties based in New Spain (Mexico) and Peru, but during the Bourbon reforms, the northern portion of Spanish South America was reorganized administratively, with the 1777 establishment of a captaincy-general based at Caracas. A great deal of information on the new jurisdiction had already been compiled by François de Pons, but was not published until 1806.{{sfn|Brading|1991|p=517}}<ref>F.J. de Pons. ''Voyage à la partie orientale de la Terre-Ferme, dans l'Amérique Méridionale, fait pendant les années 1801, 1802, 1803 et 1804 : contenant la description de la capitainerie générale de Carácas, composée des provinces de Vénézuéla, Maracaïbo, Varinas, la Guiane Espagnole, Cumana, et de l'île de la Marguerite ....'' Paris: Colnet 1806. It was also published in English the same year.</ref>

Rather than describe the administrative center of Caracas, Humboldt started his researches with the valley of Aragua, where export crops of sugar, coffee, cacao, and cotton were cultivated. Cacao plantations were the most profitable, as world demand for chocolate rose.{{sfn|Brading|1991|p=518}} It is here that Humboldt is said to have developed his idea of human-induced climate change. Investigating evidence of a rapid fall in the water level of the valley's Lake Valencia, Humboldt credited the desiccation to the clearance of tree cover and to the inability of the exposed soils to retain water. With their clear cutting of trees, the agriculturalists were removing the woodland's "threefold" moderating influence upon temperature: cooling shade, evaporation and radiation.{{sfn|Wulf|2015|pages=56–59}}

Humboldt visited the mission at [[Caripe]] and explored the [[Cueva del Guácharo National Park|Guácharo cavern]], where he found the [[oilbird]], which he was to make known to science as ''Steatornis caripensis''. He also described the [[Lake Bermudez|Guanoco]] asphalt lake as "The spring of the good priest" ("''Quelle des guten Priesters''").<ref>{{cite web|url=http://www.inveas.org.ve/noticias.asp?id=20 |title=Instituto Venezolano del Asfalto |access-date=2010-08-28 |url-status=dead |archive-url=https://web.archive.org/web/20120310235811/http://www.inveas.org.ve/noticias.asp?id=20 |archive-date=2012-03-10 }}, Instituto Venezolano del Asfalto INVEAS.org</ref><ref>{{cite web|url=http://www.parianatours.com/regionen/paria.html|title=Paría – ein abwechslungsreiches Stück Land|website=PariaTours.de|language=de|access-date=20 March 2021|archive-date=20 June 2020|archive-url=https://web.archive.org/web/20200620180938/http://www.parianatours.com/regionen/paria.html|url-status=live}}</ref> Returning to Cumaná, Humboldt observed, on the night of 11–12 November, a remarkable [[meteor shower]] (the [[Leonids]]). He proceeded with Bonpland to [[Caracas]] where he climbed the [[El Ávila National Park|Avila mount]] with the young poet [[Andrés Bello]], the former tutor of [[Simón Bolívar]], who later became the leader of independence in northern South America. Humboldt met the Venezuelan Bolívar himself in 1804 in Paris and spent time with him in Rome. The documentary record does not support the supposition that Humboldt inspired Bolívar to participate in the struggle for independence, but it does indicate Bolívar's admiration for Humboldt's production of new knowledge on Spanish America.{{sfn|de Terra|1955|pp=232–233}}

In February 1800, Humboldt and Bonpland left the coast with the purpose of exploring the course of the [[Orinoco River]] and its tributaries. This trip, which lasted four months and covered {{convert|1725|mi|km}} of wild and largely uninhabited country, had an aim of establishing the existence of the [[Casiquiare canal]] (a communication between the water systems of the rivers Orinoco and [[Amazon River|Amazon]]). Although, unbeknownst to Humboldt, this existence had been established decades before,{{sfn|Wulf|2015|p={{page needed|date=January 2021}}}} his expedition had the important results of determining the exact position of the [[River bifurcation|bifurcation]],<ref name="EB1911"/> and documenting the life of several native tribes such as the Maipures and their extinct rivals the Atures (several words of the latter tribe were transferred to Humboldt by one parrot<ref>Mark Forsyth. The etymologicon. Icon Books Ltd. London N79DP, (2011), p. 123.</ref>). Around 19 March 1800, Humboldt and Bonpland discovered dangerous [[electric eel]]s, whose shock could kill a man. To catch them, locals suggested they drive wild horses into the river, which brought the eels out from the river mud, and resulted in a violent confrontation of eels and horses, some of which died. Humboldt and Bonpland captured and dissected some eels, which retained their ability to shock; both received potentially dangerous electric shocks during their investigations. The encounter made Humboldt think more deeply about electricity and magnetism, typical of his ability to extrapolate from an observation to more general principles.<ref>{{harvnb|Wulf|2015|pp=62–63}}. Wulf's book includes a picture of the encounter (p. 63); she captions it "The battle between horses and electric eels".</ref> Humboldt returned to the incident in several of his later writings, including his travelogue ''Personal Narrative'' (1814–29), ''Views of Nature'' (1807), and ''Aspects of Nature'' (1849).<ref>Cited in {{harvnb|Wulf|2015|p=362}}, n. 62.</ref>

Two months later, they explored the territory of the Maipures and that of the then-recently extinct Atures Indians. Humboldt laid to rest the persistent myth of [[Walter Raleigh]]'s [[Lake Parime]] by proposing that the seasonal flooding of the [[Rupununi savannah]] had been misidentified as a lake.<ref>Humboldt, Alexander von. [https://web.archive.org/web/20080813083851/http://ebooks.adelaide.edu.au/h/humboldt/alexander/travels/chapter25.html ''Personal Narrative of Travels to the Equinoctial Regions of America During the Years 1799–1804'', Chapter 25. Henry G. Bohn, London, 1853.] </ref>

===Cuba, 1800, 1804===
[[File:Chiranthodendron_pentadactylon_monochrome.jpeg|thumb|Humboldt botanical drawing published in his work on Cuba]]
On 24 November 1800, the two friends set sail for Cuba, landing on 19 December,{{sfn|Nicolson|Wilson|1995|p=lxviii}} where they met fellow botanist and [[plant collector]] [[John Fraser (botanist)|John Fraser]].<ref>Brendel, Frederick, [https://www.jstor.org/stable/2449332 Historical Sketch of the Science of Botany in North America from 1635 to 1840] {{Webarchive|url=https://web.archive.org/web/20181215124932/https://www.jstor.org/stable/2449332 |date=2018-12-15 }}, ''The American Naturalist'', 13:12 (December 1879), pp. 754–771, ''The University of Chicago Press''; accessed 31 July 2012.</ref> Fraser and his son had been shipwrecked off the Cuban coast, and did not have a license to be in the Spanish Indies. Humboldt, who was already in Cuba, interceded with crown officials in Havana, as well as giving them money and clothing. Fraser obtained permission to remain in Cuba and explore. Humboldt entrusted Fraser with taking two cases of Humboldt and Bonpland's botanical specimens to England when he returned, for eventual conveyance to the German botanist Willdenow in Berlin.{{sfn|de Terra|1955|pp=116–117}} Humboldt and Bonpland stayed in Cuba until 5 March 1801, when they left for the mainland of northern South America again, arriving there on 30 March.

Humboldt is considered to be the "second discoverer of Cuba" due to the scientific and social research he conducted on this Spanish colony. During an initial three-month stay at [[Havana]], his first tasks were to survey that city properly and the nearby towns of [[Guanabacoa]], [[Regla]], and [[Bejucal]]. He befriended Cuban landowner and thinker [[Francisco de Arango y Parreño]]; together they visited the {{lang|es|Guines}} area in south Havana, the valleys of [[Matanzas]] Province, and the [[Valley of the Sugar Mills]] in [[Trinidad, Cuba|Trinidad]]. Those three areas were, at the time, the first frontier of sugar production in the island. During those trips, Humboldt collected statistical information on Cuba's population, production, technology and trade, and with Arango, made suggestions for enhancing them. He predicted that the agricultural and commercial potential of Cuba was huge and could be vastly improved with proper leadership in the future.

On their way back to Europe from the Americas, Humboldt and Bonpland stopped again in Cuba, leaving from the port of Veracruz and arriving in Cuba on 7 January 1804, staying until 29 April 1804. In Cuba, he collected plant material and made extensive notes. During this time, he socialized with his scientific and landowner friends, conducted mineralogical surveys, and finished his vast collection of the island's flora and fauna that he eventually published as ''Essai politique sur l'îsle de Cuba''.{{Sfn|Humboldt chronology|p= lxix}}

===The Andes, 1801–1803===
[[File:Humboldt-Bonpland Chimborazo.jpg|thumb|upright=1.4|Humboldt and his fellow scientist Aimé Bonpland near the foot of the [[Chimborazo]] volcano, painting by [[Friedrich Georg Weitsch]] (1810)]]

After their first stay in Cuba of three months, they returned to the mainland at [[Cartagena de Indias]] (now in Colombia), a major center of trade in northern South America. Ascending the swollen stream of the [[Magdalena River]] to Honda, they arrived in Bogotá on 6 July 1801, where they met the Spanish botanist [[José Celestino Mutis]], head of the Royal Botanical Expedition to New Granada, staying there until 8 September 1801. Mutis was generous with his time and gave Humboldt access to the huge pictorial record he had compiled since 1783. Mutis was based in Bogotá, but as with other Spanish expeditions, he had access to local knowledge and a workshop of artists, who created highly accurate and detailed images. This type of careful recording meant that even if specimens were not available to study at a distance, "because the images travelled, the botanists did not have to".{{sfn|Bleichmar|2012|p=190}} Humboldt was astounded at Mutis's accomplishment; when Humboldt published his first volume on botany, he dedicated it to Mutis "as a simple mark of our admiration and acknowledgement".<ref>Alexander von Humboldt and Aimé Bonpland, ''Plantes équinoxiles, in ''Voyage de Humboldt et Bonpland, Sixième Partie, Botanique, vo. 1 Paris 1808.</ref>

Humboldt had hopes of connecting with the French sailing expedition of Baudin, now finally underway, so Bonpland and Humboldt hurried to Ecuador.{{Sfn|Humboldt chronology|p= lxix}} They crossed the frozen ridges of the [[Cordillera Real (Ecuador)|Cordillera Real]] and reached [[Quito]] on 6 January 1802, after a tedious and difficult journey.

Their stay in Ecuador was marked by the ascent of the active volcano [[Pichincha (volcano)|Pichincha]] and their climb of the extinct, snow-capped volcano [[Chimborazo]], where Humboldt and his party, consisting of himself, Bonpland, a number of Indians and the Ecuadorian nobleman [[Carlos de Montúfar|Carlos Montúfar]], reached an altitude of {{convert|19286|ft|m}}.<ref name="McC">{{cite book|last=McCullough|first=David|author-link=David McCullough|title=Brave Companions. Portraits of History|publisher=Simon & Schuster|date=1992|page=[https://archive.org/details/bravecompanions00davi/page/3 3ff]|isbn=0-6717-9276-8|url=https://archive.org/details/bravecompanions00davi/page/3}}</ref> This was a world record at the time, higher even than had been ascended in a balloon, (for a westerner—[[Inca Empire|Incas]] had climbed much higher altitudes centuries before),<ref>{{cite journal|last1=Mignone|first1=Pablo|title=Ritualidad estatal, capacocha y actores sociales locales: El Cementerio del volcán Llullaillaco|journal=[[Estudios Atacameños]]|date=2010|issue=40|pages=43–62|doi=10.4067/S0718-10432010000200004|language=es|issn=0718-1043|doi-access=free|quote=[D]iscutimos el clásico enfoque arqueológico acerca de este tipo de ritual como dominio exclusivo y protagónico del Estado inca [...] Luego el camino se bifurca para dirigirse uno hacia una plataforma de entierro, a 6715 m.snm, y el otro a la cima del volcán, unos 20 m más arriba.|hdl=11336/14124|hdl-access=free}}</ref> but 1000 feet short of the summit.<ref>Humboldt's claim was disputed by mountaineer [[Edward Whymper]] when he made the first ascent of Chimborazo in 1880.{{cite book|last=Whymper|first=Edward|author-link=Edward Whymper|title=Travels amongst the Great Andes of the Equator |url=https://archive.org/details/amongstgr00whymtravelsrich |publisher=John Murray |year=1892 |pages=[https://archive.org/details/amongstgr00whymtravelsrich/page/30 30]–32}}</ref> Humboldt's journey concluded with an expedition to the sources of the Amazon ''en route'' for [[Lima]], Peru.<ref>{{cite journal | last1 = Muratta Bunsen | first1 = Eduardo | year = 2010 | title = El conflicto entre eurocentrismo y empatía en la literatura de viajes de Humboldt | journal = Revista Andina | volume = 50 | pages = 247–262 }}</ref>

At [[Callao]], the main port for Peru, Humboldt observed the [[transit of Mercury]] on 9 November and studied the fertilizing properties of [[guano]], rich in nitrogen, the subsequent introduction of which into Europe was due mainly to his writings.<ref name="EB1911"/>

===New Spain (Mexico), 1803–1804===
[[File:MINA_GTO.jpg|thumb|upright=1.1|Silver mining complex of La Valenciana, Guanajuato, Mexico]]
[[File:Vues des Cordillères, et monumens des peuples indigènes de l'Amérique (1813) (14781309784).jpg|thumb|upright=1.1|[[Basaltic Prisms of Santa María Regla|Basalt prisms at Santa María Regla]], Mexico by Alexander von Humboldt, published in ''Vue des Cordillères et monuments des peuples indigènes de l'Amérique'']]
[[File:1479 Stein der fünften Sonne, sog. Aztekenkalender, Ollin Tonatiuh anagoria.JPG|thumb|upright=1.1|Aztec calendar stone]]
[[File:Humboldt 1810 pp 47 48 50 51 52.jpg|thumb|upright=1.1|[[Dresden Codex]], later identified as a Maya manuscript, published in part by Humboldt in 1810]]
Humboldt and Bonpland had not intended to go to New Spain, but when they were unable to join a voyage to the Pacific, they left the Ecuadorian port of Guayaquil and headed for [[Acapulco]] on Mexico's west coast. Even before Humboldt and Bonpland started on their way to New Spain's [[Mexico City|capital]] on Mexico's central plateau, Humboldt realized the captain of the vessel that brought them to Acapulco had reckoned its location incorrectly. Since Acapulco was the main west-coast port and the terminus of the [[Manila Galleon|Asian trade]] from the Spanish Philippines, having accurate maps of its location was extremely important. Humboldt set up his instruments, surveying the deep-water bay of Acapulco, to determine its longitude.{{sfn|de Terra|1955|pp=149–150}}{{Sfn|Humboldt chronology|p= lxviii–lxvix}}

Humboldt and Bonpland landed in Acapulco on 15 February 1803, and from there they went to [[Taxco]], a silver-mining town in modern [[Guerrero]]. In April 1803, he visited [[Cuernavaca]], [[Morelos]]. Impressed by its climate, he nicknamed the city the ''City of Eternal Spring''.<ref>{{cite web|url=https://masdemorelos.masdemx.com/2018/04/cuernavaca-morelos-eterna-primavera-von-humboldt-exploraciones-historia/|title=La breve exploración de este magnífico personaje puso a Cuernavaca en el mapa mundial|language=es|website=masdemorelos.masdemx.com|date=3 April 2018|access-date=21 April 2021|archive-date=10 April 2019|archive-url=https://web.archive.org/web/20190410214717/https://masdemorelos.masdemx.com/2018/04/cuernavaca-morelos-eterna-primavera-von-humboldt-exploraciones-historia/|url-status=live}}</ref><ref>{{cite web|url=http://www.moreloshabla.com/morelos/cuernavaca/por-que-le-decimos-ciudad-de-la-eterna-primavera-a-cuernavaca/|title= Morelos Habla {{!}} ¿por qué le decimos ciudad de la eterna primavera a cuernavaca |archive-url=https://web.archive.org/web/20181218191121/http://www.moreloshabla.com/morelos/cuernavaca/por-que-le-decimos-ciudad-de-la-eterna-primavera-a-cuernavaca/ |archive-date=2018-12-18 }} accessed Dec 28, 2018</ref> Humboldt and Bonpland arrived in Mexico City, having been officially welcomed via a letter from the king's representative in New Spain, Viceroy Don [[José de Iturrigaray]]. Humboldt was also given a special passport to travel throughout New Spain and letters of introduction to intendants, the highest officials in New Spain's administrative districts (intendancies). This official aid to Humboldt allowed him to have access to crown records, mines, landed estates, canals, and Mexican antiquities from the prehispanic era.{{sfn|de Terra|1955|p=156}} Humboldt read the writings of Bishop-elect of the important diocese of Michoacan [[Manuel Abad y Queipo]], a [[classical liberal]], that were directed to the crown for the improvement of New Spain.{{sfn|Brading|1991|p=527}}

They spent the year in the viceroyalty, traveling to different Mexican cities in the central plateau and the northern mining region. The first journey was from Acapulco to Mexico City, through what is now the Mexican state of [[Guerrero]]. The route was suitable only for mule train, and all along the way, Humboldt took measurements of elevation. When he left Mexico a year later in 1804, from the east coast port of Veracruz, he took a similar set of measures, which resulted in a chart in the ''Political Essay'', the physical plan of Mexico with the dangers of the road from Acapulco to Mexico City, and from Mexico City to Veracruz.<ref>''Plano físico de la Nueva España, Perfil del Camino de Acapulco a Mégico [sic], y de Mégico a Veracruz''. Chart is published in Magali M. Carrera, ''Traveling from New Spain to Mexico: Mapping Practices of Nineteenth-century Mexico'', Durham: Duke University Press 2011, p. 70, plate 18.</ref> This visual depiction of elevation was part of Humboldt's general insistence that the data he collected be presented in a way more easily understood than statistical charts. A great deal of his success in gaining a more general readership for his works was his understanding that "anything that has to do with extent or quantity can be represented geometrically. Statistical projections [charts and graphs], which speak to the senses without tiring the intellect have the advantage of bringing attention to a large number of important facts".<ref>Alexander von Humboldt, ''Atlás géographique et physique du Royaume de la Nouvelle-Espagne'', lxxxiii–lxxiv, quoted in Anne Godlewska, ''Geography Unbound: French Geographic Science from Cassini to Humboldt''. Chicago: University of Chicago Press 1999, p. 257.</ref>

Humboldt was impressed with Mexico City, which at the time was the largest city in the Americas, and one that could be counted as modern. He declared "no city of the new continent, without even excepting those of the United States, can display such great and solid scientific establishments as the capital of Mexico".<ref>Humboldt, ''Political essay'', p. 74.</ref> He pointed to the [[Palacio de Minería#History|Royal College of Mines]], the [[National Palace (Mexico)#Viceregal palace|Royal Botanical Garden]] and the [[Academy of San Carlos|Royal Academy of San Carlos]] as exemplars of a metropolitan capital in touch with the latest developments on the continent and insisting on its modernity.{{sfn|Brading|1991|pp=526–527}} He also recognized important [[Criollo people|criollo]] savants in Mexico, including [[José Antonio de Alzate y Ramírez]], who died in 1799, just before Humboldt's visit; Miguel Velásquez de León; and [[Antonio de León y Gama]].{{sfn|Brading|1991|p=527}}

Humboldt spent time at the Valenciana silver mine in [[Guanajuato]], central New Spain, at the time the most important in the Spanish empire.{{sfn|Brading|1991|p=525}} The bicentennial of his visit in Guanajuato was celebrated with a conference at the [[University of Guanajuato]], with Mexican academics highlighting various aspects of his impact on the city.<ref>José Luis Lara Valdés, ''Bicentenario de Humboldt en Guanajuato (1803–2003)''. Guanajuato: Ediciones La Rana 2003.</ref> Humboldt could have simply examined the geology of the fabulously rich mine, but he took the opportunity to study the entire mining complex as well as analyze mining statistics of its output. His report on silver mining is a major contribution, and considered the strongest and best informed section of his ''Political Essay''. Although Humboldt was himself a trained geologist and mining inspector, he drew on mining experts in Mexico. One was [[Fausto Elhuyar]], then head of the General Mining Court in Mexico City, who, like Humboldt was trained in Freiberg. Another was [[Andrés Manuel del Río]], director of Royal College of Mines, whom Humboldt knew when they were both students in Freiberg.{{sfn|de Terra|1955|pp=51, 156}} The Bourbon monarchs had established the mining court and the college to elevate mining as a profession, since revenues from silver constituted the crown's largest source of income. Humboldt also consulted other German mining experts, who were already in Mexico.{{sfn|Brading|1991|p=527}} While Humboldt was a welcome foreign scientist and mining expert, the Spanish crown had established fertile ground for Humboldt's investigations into mining.

Spanish America's ancient civilizations were a source of interest for Humboldt, who included images of Mexican manuscripts (or codices) and Inca ruins in his richly illustrated ''Vues des cordillères et monuments des peuples indigènes de l'Amerique'' (1810–1813), the most experimental of Humboldt's publications, since it does not have "a single ordering principle" but his opinions and contentions based on observation.{{sfn|Kutzinski|Ette|2012|page=xxi}} For Humboldt, a key question was the influence of climate on the development of these civilizations.{{sfn|Brading|1991|p=523}} When he published his ''Vues des cordillères'', he included a color image of the [[Aztec calendar stone]] (which had been discovered in 1790 buried in the [[Zócalo|main plaza]] of Mexico City), along with select drawings of the [[Dresden Codex]] and others he sought out later in European collections. His aim was to muster evidence that these pictorial and sculptural images could allow the reconstruction of prehispanic history. He sought out Mexican experts in the interpretation of sources from there, especially Antonio Pichardo, who was the literary executor of [[Antonio de León y Gama]]'s work. For American-born Spaniards ([[Criollo people|criollos]]) who were seeking sources of pride in Mexico's ancient past, Humboldt's recognition of these ancient works and dissemination in his publications was a boon. He read the work of exiled Jesuit [[Francisco Javier Clavijero]], which celebrated Mexico's prehispanic civilization, and which Humboldt invoked to counter the pejorative assertions about the new world by Buffon, de Pauw, and Raynal.{{sfn|Kutzinski|Ette|2012|p=xv}} Humboldt ultimately viewed both the prehispanic realms of Mexico and Peru as despotic and barbaric.{{sfn|Brading|1991|pp=523–525}} However, he also drew attention to indigenous monuments and artifacts as cultural productions that had "both ... historical ''and'' artistic significance".{{sfn|Kutzinski|Ette|2012|p=xxxiii}}

One of his most widely read publications resulting from his travels and investigations in Spanish America was the ''Essai politique sur le royaum de la Nouvelle Espagne'', quickly translated to English as ''Political Essay on the Kingdom of New Spain'' (1811).<ref>''Political Essay on the Kingdom of New Spain'', (four volumes) translator John Black, London/Edinburgh: Longman, Hurst, Rees Orme and brown; and H. Colborn and W. Blackwood, and Brown and Crombie, Edinburgh 1811.</ref> This treatise was the result of Humboldt's own investigations as well as the generosity of Spanish colonial officials for statistical data.<ref>Benjamin Keen, "Alexander von Humboldt" in ''Encyclopedia of Mexico''. Chicago: Fitzroy Dearborn 1997, p. 664.</ref>

===The United States, 1804===
[[File:Louisiana1804a.jpg|thumb|1804 map of the Louisiana Territory. Jefferson and his cabinet sought information from Humboldt when he visited Washington, D.C., about Spain's territory in Mexico, now bordering the U.S.]]

Leaving from Cuba, Humboldt decided to take an unplanned short visit to the United States. Knowing that the current U.S. president, [[Thomas Jefferson]], was himself a scientist, Humboldt wrote to him saying that he would be in the United States. Jefferson warmly replied, inviting him to visit the [[White House]] in the nation's new capital. In his letter Humboldt had gained Jefferson's interest by mentioning that he had discovered [[mammoth]] teeth near the Equator. Jefferson had previously written that he believed mammoths had never lived so far south. Humboldt had also hinted at his knowledge of New Spain.<ref name="Schwarz-2001">{{cite journal |last=Schwarz |first=Ingo |date=2001-01-01 |title=Alexander von Humboldt's Visit to Washington and Philadelphia, His Friendship with Jefferson, and His Fascination with the United States |journal=Northeastern Naturalist |volume=8 |pages=43–56|doi=10.1656/1092-6194(2001)8[43:AVHVTW]2.0.CO;2 }}</ref>

Arriving in [[Philadelphia]], which was a center of learning in the U.S., Humboldt met with some of the major scientific figures of the era, including chemist and anatomist [[Caspar Wistar (physician)|Caspar Wistar]], who pushed for compulsory smallpox vaccination, and botanist [[Benjamin Smith Barton]], as well as physician [[Benjamin Rush]], a signer of the [[United States Declaration of Independence|Declaration of Independence]], who wished to hear about [[cinchona]] bark from a South American tree, which cured fevers.{{sfn|de Terra|1955|pp=175–176}} Humboldt's treatise on cinchona was published in English in 1821.<ref>{{cite book |first=Alexander von |last=Humboldt |url=https://www.biodiversitylibrary.org/item/14437 |title=An illustration of the genus Cinchona | publisher=Printed for J. Searle | location=London | year=1821 | doi=10.5962/bhl.title.715}}</ref>

After arriving in Washington D.C, Humboldt held numerous intense discussions with Jefferson on both scientific matters and also his year-long stay in New Spain. Jefferson had only recently concluded the [[Louisiana Purchase]], which now placed New Spain on the southwest border of the United States. The Spanish minister in Washington, D.C. had declined to furnish the U.S. government with information about Spanish territories, and access to the territories was strictly controlled. Humboldt was able to supply Jefferson with the latest information on the population, trade agriculture and military of New Spain. This information would later be the basis for his ''Essay on the Political Kingdom of New Spain'' (1810).

Jefferson was unsure of where the border of the newly-purchased [[Louisiana]] was precisely, and Humboldt wrote him a two-page report on the matter. Jefferson would later refer to Humboldt as "the most scientific man of the age". [[Albert Gallatin]], Secretary of the Treasury, said of Humboldt "I was delighted and swallowed more information of various kinds in less than two hours than I had for two years past in all I had read or heard." Gallatin, in turn, supplied Humboldt with information he sought on the United States.<ref name="Schwarz-2001"/>

After six weeks, Humboldt set sail for Europe from the mouth of the [[Delaware River|Delaware]] and landed at [[Bordeaux]] on 3 August 1804.

===Travel diaries===
Humboldt kept a detailed diary of his sojourn to Spanish America, running some 4,000 pages, which he drew on directly for his multiple publications following the expedition. The leather-bound diaries themselves are now in Germany, having been returned from Russia to East Germany, where they were taken by the Red Army after World War II. Following German reunification, the diaries were returned to a descendant of Humboldt. For a time, there was concern about their being sold, but that was averted.<ref>[https://www.dw.com/en/humboldt-america-diaries-to-stay-in-germany/a-17271671 "Humboldt 'America' diaries to stay in Germany"] {{Webarchive|url=https://web.archive.org/web/20200610003917/https://www.dw.com/en/humboldt-america-diaries-to-stay-in-germany/a-17271671 |date=2020-06-10 }}, [[Deutsche Welle]], 4 December 2013. Accessed 6 April 2021</ref> A government-funded project to digitize the Spanish American expedition as well as his later Russian expedition has been undertaken (2014–2017) by the University of Potsdam and the German State Library–Prussian Cultural Heritage Foundation.<ref>{{cite web|url=http://www.uni-potsdam.de/tapoints/?p=1654 |title=Alexander von Humboldt: A nomad and researcher in the focus of two projects|work=POINTS – Potsdam International Network for TransArea Studies|archive-url=https://web.archive.org/web/20170302030831/http://www.uni-potsdam.de/tapoints/?p=1654 |archive-date=2017-03-02|accessdate= March 1, 2017}}</ref>

===Achievements of the Hispanic American expedition===
{{see also|Humboldtian science}}
Humboldt's decades' long endeavor to publish the results of this expedition not only resulted in multiple volumes, but also made his international reputation in scientific circles. Humboldt came to be well-known with the reading public as well, with popular, densely illustrated, condensed versions of his work in multiple languages. Bonpland, his fellow scientist and collaborator on the expedition, collected botanical specimens and preserved them, but unlike Humboldt who had a passion to publish, Bonpland had to be prodded to do the formal descriptions. Many scientific travelers and explorers produced huge visual records which remained unseen by the general public until the late nineteenth century. In the case of the Malaspina Expedition, it was not until the late twentieth century when Mutis's botanical, some 12,000 drawings from New Granada, was published. Humboldt, by contrast, published immediately and continuously, using and ultimately exhausting his personal fortune, to produce both scientific and popular texts. Humboldt's name and fame were made by his travels to Spanish America, particularly his publication of the ''Political Essay on the Kingdom of New Spain''; his image as the premier European scientist was a later development.<ref>Nicolaas Rupke, "A Geography of Enlightenment: The Critical Reception of Alexander von Humboldt's Mexico Work". In ''Geography and Enlightenment'', edited by David N. Livingstone and Charles W. J. Withers, 319–339. Chicago: University of Chicago Press 1999.</ref>

For the Bourbon crown, which had authorized the expedition, the returns were not only tremendous in terms of sheer volume of data on their New World realms, but in dispelling the vague and pejorative assessments of the New World by [[Guillaume-Thomas Raynal]], [[Georges-Louis Leclerc, Comte de Buffon]], and [[William Robertson (historian)|William Robertson]]. The achievements of the Bourbon regime, especially in New Spain, were evident in the precise data Humboldt systematized and published.{{sfn|Brading|1991|p=527}}

This memorable expedition may be regarded as having laid the foundation of the sciences of [[physical geography]], [[plant geography]], and [[meteorology]]. Key to that was Humboldt's meticulous and systematic measurement of phenomena with the most advanced instruments then available. He closely observed plant and animal species in situ, not just in isolation, noting all elements in relation to one other. He collected specimens of plants and animals, dividing the growing collection so that if a portion was lost, other parts might survive.

[[File:Frederich heinrich baron von humboldt-charles wilson peale.JPG|thumb|upright|Humboldt depicted by American artist [[Charles Willson Peale]], 1805, who met Humboldt when he visited the U.S. in 1804]]

Humboldt saw the need for an approach to science that could account for the harmony of nature among the diversity of the physical world. For Humboldt, "the unity of nature" meant that it was the interrelation of all [[physical sciences]]—such as the conjoining between [[biology]], [[meteorology]] and [[geology]]—that determined where specific plants grew. He found these relationships by unraveling myriad, painstakingly collected data,{{sfn|Helferich|2004|p=25}} data extensive enough that it became an enduring foundation upon which others could base their work. Humboldt viewed nature [[holism|holistically]], and tried to explain natural phenomena without the appeal to religious dogma. He believed in the central importance of observation, and as a consequence had amassed a vast array of the most sophisticated scientific instruments then available. Each had its own velvet lined box and was the most accurate and portable of its time; nothing quantifiable escaped measurement. According to Humboldt, everything should be measured with the finest and most modern instruments and sophisticated techniques available, for that collected data was the basis of all scientific understanding.

This quantitative methodology would become known as [[Humboldtian science]]. Humboldt wrote "Nature herself is sublimely eloquent. The stars as they sparkle in firmament fill us with delight and ecstasy, and yet they all move in orbit marked out with mathematical precision."<ref>Alexander von Humboldt, ''Personal Narrative of Travels of the Equinocial Regions of the New Continent during Years 1799–1804'' (London, 1814), Vol. 1, pp.&nbsp;34–35</ref> However, [[Andreas Daum]] has recently revisited the concept of Humboldtian Science and set it apart from "Humboldt's science".{{sfn |Daum |2024b |pp=29–51 }}

[[File:Zentralbibliothek Zürich - Ideen zu einer Geographie der Pflanzen nebst einem Naturgemälde der Tropenländer - 000012142.jpg|thumb|Humboldt's ''Naturgemälde'', also known as the Chimborazo Map, is his depiction of the volcanoes Chimborazo and Cotopaxi in cross section, with detailed information about plant geography. The illustration was published in ''The Geography of Plants'', 1807, in a large format (54 cm x 84 cm). Largely used for global warming analyses, this map depicts in fact the vegetation of another volcano: the [[Antisana]].<ref>P. Moret ''et al.'', Humboldt's Tableau Physique revisited, PNAS, 2019 {{doi|10.1073/pnas.1904585116}}</ref>]]
His ''Essay on the Geography of Plants'' (published first in French and then German, both in 1807) was based on the then novel idea of studying the distribution of organic life as affected by varying physical conditions.<ref name="EB1911"/> This was most famously depicted in his published cross-section of Chimborazo, approximately two feet by three feet (54&nbsp;cm x 84&nbsp;cm) color pictorial, he called ''Ein Naturgemälde der Anden'' and what is also called the Chimborazo Map. It was a fold-out at the back of the publication.{{sfn|Zimmerer|2011|p=125}} Humboldt first sketched the map when he was in South America, which included written descriptions on either side of the cross-section of Chimborazo. These detailed the information on temperature, altitude, humidity, atmosphere pressure, and the animal and plants (with their scientific names) found at each elevation. Plants from the same genus appear at different elevations. The depiction is on an east-west axis going from the Pacific coast lowlands to the Andean range of which Chimborazo was a part, and the eastern Amazonian basin. Humboldt showed the three zones of coast, mountains, and Amazonia, based on his own observations, but he also drew on existing Spanish sources, particularly [[Pedro Cieza de León]], which he explicitly referred to. The Spanish American scientist [[Francisco José de Caldas]] had also measured and observed mountain environments and had earlier come to similar ideas about environmental factors in the distribution of life forms.{{sfn|Zimmerer|2011|p=129}} Humboldt was thus not putting forward something entirely new, but it is argued that his finding is not derivative either.<ref>Jorge Cañizares-Esguerra, ''How to Write the History of the New World: Histories, Epistemologies, and Identities in the Eighteenth-Century Atlantic World''. Stanford: Stanford University Press 2001.</ref> The Chimborazo map displayed complex information in an accessible fashion. The map was the basis for comparison with other major peaks. "The Naturgemälde showed for the first time that nature was a global force with corresponding climate zones across continents."<ref>{{harvnb|Wulf|2015|p=89}}. This publication includes Humboldt's first sketch of the ''Naturgemälde''.</ref> Another assessment of the map is that it "marked the beginning of a new era of environmental science, not only of mountain ecology but also of global-scale biogeophysical patterns and processes."{{sfn|Zimmerer|2011|p=125}}

[[File:Woodbridge_isothermal_chart3.jpg|thumb|Isothermal map of the world using Humboldt's data by [[William Channing Woodbridge]]]]

By his delineation (in 1817) of [[isothermal]] lines, he at once suggested the idea and devised the means of comparing the climatic conditions of various countries. He first investigated the rate of decrease in mean temperature with the increase in elevation above sea level, and afforded, by his inquiries regarding the origin of tropical storms, the earliest clue to the detection of the more complicated law governing atmospheric disturbances in higher latitudes.<ref name="EB1911"/><ref>Alexander von Humboldt, ''Des lignes isothermes et de la distribution de la châleur sur le globe''. Paris 1817.</ref> This was a major contribution to climatology.{{sfn|de Terra|1955|p=380}}<ref>A.H. Robinson and Helen M. Wallis. "Humboldt's Map of Isothermal Lines: a Milestone in Thematic Cartography". ''Cartographic Journal'' 4 (1967) 119–123.</ref>

His discovery of the decrease in intensity of Earth's [[magnetic field]] from the poles to the equator was communicated to the Paris Institute in a memoir read by him on 7 December 1804. Its importance was attested by the speedy emergence of rival claims.<ref name="EB1911"/>

His services to geology were based on his attentive study of the [[volcano]]es of the Andes and Mexico, which he observed and sketched, climbed, and measured with a variety of instruments. By climbing Chimborazo, he established an altitude record which became the basis for measurement of other volcanoes in the Andes and the Himalayas. As with other aspects of his investigations, he developed methods to show his synthesized results visually, using the graphic method of geologic-cross sections.{{sfn|de Terra|1955|pp=375–376}} He showed that volcanoes fell naturally into linear groups, presumably corresponding with vast subterranean fissures; and by his demonstration of the [[igneous rock|igneous]] origin of rocks previously held to be of aqueous formation, he contributed largely to the elimination of erroneous views, such as [[Neptunism]].<ref name="EB1911"/>

Humboldt was a significant contributor to cartography, creating maps, particularly of New Spain, that became the template for later mapmakers in Mexico. His careful recording of latitude and longitude led to accurate maps of Mexico, the port of Acapulco, the port of Veracruz, and the Valley of Mexico, and a map showing trade patterns among continents. His maps also included schematic information on geography, converting areas of administrative districts (intendancies) using proportional squares.<ref>Magali M. Carrera, ''Traveling from New Spain to Mexico: Mapping Practices of Nineteenth-century Mexico''. Durham: Duke University Press 2011, pp. 74–75.</ref> The U.S. was keen to see his maps and statistics on New Spain, since they had implication for territorial claims following the Louisiana Purchase.{{sfn|de Terra|1955|pp=177–178}} Later in life, Humboldt published three volumes (1836–39) examining sources that dealt with the early voyages to the Americas, pursuing his interest in nautical astronomy in the fifteenth and sixteenth centuries. His research yielded the origin of the name "America", put on a map of the Americas by [[Martin Waldseemüller]].<ref>Alexander von Humboldt, ''Examen critique de l'histoire de la géographie du Nouveau Continent et des progrès de l'astronomie nautique au 15e et 16e siècles''. Paris, 1836–39</ref>

[[File:Head-claw-Vultur-gryphus-Humboldt-Zoologie-T09p170.png|thumb|right|Humboldt's depiction of an [[Andean condor]], an example of his detailed drawing]]

Humboldt conducted a census of the indigenous and European inhabitants in [[New Spain]], publishing a schematized drawing of racial types and populations distribution, grouping them by region and social characteristics.<ref>Carrera, ''Mapping New Spain'', p. 76, reproducing the chart, illustration 23, p. 77.</ref> He estimated the population to be six million individuals.<ref>{{Cite book|last=Humboldt|first=Alexander von|title=Political Essay on the Kingdom of New Spain|year=1811|publisher=F. Schoell, Paris|language=fr}}</ref><ref>{{cite web|last=McCaa|first=Robert|title=The Peopling of Mexico from Origins to Revolution|publisher=Richard Steckel and Michael Haines (eds.). Cambridge University Press|date=8 December 1997|work=The Population History of North America|url=http://www.hist.umn.edu/~rmccaa/mxpoprev/cambridg3.htm|access-date=29 June 2015|archive-date=16 April 2016|archive-url=https://web.archive.org/web/20160416075826/http://www.hist.umn.edu/~rmccaa/mxpoprev/cambridg3.htm|url-status=live}}</ref> He estimated Indians to be forty percent of New Spain's population, but their distribution being uneven; the most dense were in the center and south of Mexico, the least dense in the north. He presented these data in chart form, for easier understanding.<ref>Humboldt, ''Political essay on the Kingdom of New Spain'', chapter entitled "Indians".</ref> He also surveyed the non-Indian population, categorized as Whites (Spaniards), ''Negroes'', and castes (''[[casta]]s'').<ref>Humboldt, ''Political essay'', chapter entitled "Whites, Negroes, Castes".</ref> American-born Spaniards, so-called ''[[Criollo people|creoles]]'' had been [[pintura de castas|painting depictions of mixed-race family groupings]] in the eighteenth century, showing father of one racial category, mother of another, and the offspring in a third category in hierarchical order, so racial hierarchy was an essential way elites viewed Mexican society.<ref>Ilona Katzew, ''Casta Painting''. New Haven: Yale University Press.</ref> Humboldt reported that American-born Spaniards were legally racial equals of [[peninsulares|those born in Spain]], but the crown policy since the Bourbons took the Spanish throne privileged those born in Iberia. Humboldt observed that "the most miserable European, without education and without intellectual cultivation, thinks himself superior to whites born in the new continent".<ref>Humboldt, ''Political essay'', p. 71.</ref> The truth in this assertion, and the conclusions derived from them, have been often disputed as superficial, or politically motivated, by some authors, considering that between 40% and 60% of high offices in the new world were held by creoles.<ref>P. Victoria "Grandes mitos de la historia de Colombia" (Great myths in Colombian History). Grupo Planeta – Colombia, May 31, 2011</ref><ref name="José Oscar Frigerio 1801">José Oscar Frigerio, La rebelión criolla de Oruro fue juzgada en Buenos Aires (1781–1801), Ediciones del Boulevard, Córdoba, 2011.</ref>
The enmity between some creoles and the peninsular-born whites increasingly became an issue in the late period of Spanish rule, with creoles increasingly alienated from the crown. Humboldt's assessment was that royal government abuses and the example of [[American Revolution|a new model of rule]] in the United States were eroding the unity of whites in New Spain.<ref>Humboldt, ''Political essay'', p. 72.</ref> Humboldt's writings on race in New Spain were shaped by the memorials of the [[classical liberal]], enlightened Bishop-elect of Michoacán, [[Manuel Abad y Queipo]], who personally presented Humboldt with his printed memorials to the Spanish crown critiquing social and economic conditions and his recommendations for eliminating them.<ref>D.A. Brading, ''Church and State in Bourbon Mexico: The Diocese of Michoacán 1749–1810''. Cambridge: Cambridge University Press 1994, p. 228.</ref><ref name="José Oscar Frigerio 1801"/>

One scholar says that his writings contain fantastical descriptions of America, while leaving out its inhabitants, stating that Humboldt, coming from the [[Romanticism|Romantic]] school of thought, believed '...&nbsp;nature is perfect till man deforms it with care'.<ref name="Pratt 1997">{{Cite book|last=Pratt|first=Mary Louise|author-link=Mary Louise Pratt|title=Imperial Eyes: Travel Writing and Transculturation|year=1997|publisher=Routledge|location=London|isbn=0415060958}}</ref> The further assessment is that he largely neglected the human societies amidst nature. Views of indigenous peoples as 'savage' or 'unimportant' leaves them out of the historical picture.<ref name="Pratt 1997"/> Other scholars counter that Humboldt dedicated large parts of his work to describing the [[Slavery in the Spanish Empire|conditions of slaves]], indigenous peoples, mixed-race [[castas]], and society in general. He often showed his disgust for the slavery<ref name="McC"/>and inhumane conditions in which indigenous peoples and others were treated and he often criticized Spanish colonial policies.{{sfn|Rupke|2008|p=138}}

Humboldt was not primarily an artist, but he could draw well, allowing him to record a visual record of particular places and their natural environment. Many of his drawings became the basis for illustrations of his many scientific and general publications. Artists whom Humboldt influenced, such as [[Johann Moritz Rugendas]], followed in his path and painted the same places Humboldt had visited and recorded, such as the basalt formations in Mexico, which was an illustration in his ''Vues des Cordillères''.<ref>Alexander von Humboldt, ''Vues des Cordillères et monumens des peuples indigènes de l'Amerique''. Paris: F. Schoell, 180–13.</ref><ref>Sigrid Achenbach, ''Kunst um Humboldt: Reisestudien aus Mittel- un Südamerika von Rugendas, Bellermann un Hildebrandt im Berliner Kupferstichkabinett''. Munich: Hirmer Verlag München 2009, 105, catalog 52.</ref>

The editing and publication of the encyclopedic mass of scientific, political and archaeological material that had been collected by him during his absence from Europe was now Humboldt's most urgent desire. After a short trip to Italy with [[Joseph Louis Gay-Lussac]] for the purpose of investigating the law of [[magnetic declination]] and a stay of two and a half years in Berlin, in the spring of 1808, he settled in Paris. His purpose for being located there was to secure the scientific cooperation required for bringing his great work through the press. This colossal task, which he at first hoped would occupy but two years, eventually cost him twenty-one, and even then it remained incomplete.

{{Gallery
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|File:HumboldtHouseDF.JPG
|House where Humboldt and Bonpland lived in [[Mexico City]] in 1803, located at 80 Rep. de Uruguay in the [[Centro (Mexico City)|historic centre]], just south of the [[Zocalo]]
}}

==Scholarly and public recognition==
[[File:Alexander von humboldt 1807 225-91-1-PB.jpeg|upright|thumb|Humboldt in Berlin 1807]]
During his lifetime Humboldt became one of the most famous men in Europe.{{sfn|Sachs|2006|p=1}} Academies, both native and foreign, were eager to elect him to their membership, the first being The [[American Philosophical Society]]<ref>{{Cite web|title=APS Member History|url=https://search.amphilsoc.org/memhist/search?creator=F.H.+Alexander+von+Humboldt&title=&subject=&subdiv=&mem=&year=&year-max=&dead=&keyword=&smode=advanced|access-date=2021-04-01|website=search.amphilsoc.org}}</ref> in Philadelphia, which he visited at the tail end of his travel through the Americas. He was elected to the [[Prussian Academy of Sciences]] in 1805.{{sfn|de Terra|1955|p=204}}

Over the years other learned societies in the U.S. elected him a member, including the [[American Antiquarian Society]] (Worcester, MA) in 1816;<ref>{{cite web|url=http://www.americanantiquarian.org/memberlisth|title=MemberListH|website=Americanantiquarian.org|access-date=9 April 2018|archive-date=29 June 2015|archive-url=https://web.archive.org/web/20150629011805/http://www.americanantiquarian.org/memberlisth|url-status=live}}</ref> the [[Linnean Society of London]] in 1818; the [[New York Historical Society]] in 1820; a Foreign Honorary Member of the [[American Academy of Arts and Sciences]] in 1822;<ref>{{cite web|title=Book of Members, 1780–2010: Chapter H|url=http://www.amacad.org/publications/BookofMembers/ChapterH.pdf|publisher=American Academy of Arts and Sciences|access-date=7 April 2011|archive-date=19 June 2018|archive-url=https://web.archive.org/web/20180619012658/http://www.amacad.org/publications/BookofMembers/ChapterH.pdf|url-status=live}}</ref> the [[American Ethnological Society]] (New York) in 1843; and the American Geographical and Statistical Society, (New York) in 1856.{{sfn|de Terra|1955|p=377}} He was elected a foreign member of the [[Royal Swedish Academy of Sciences]] in 1810. The [[Royal Society]], whose president Sir Joseph Banks had aided Humboldt as a young man, now welcomed him as a foreign member.{{sfn|Wulf|2015|p=166}}

After Mexican independence from Spain in 1821, the Mexican government recognized him with high honors for his services to the nation. In 1827, the first [[President of Mexico]], [[Guadalupe Victoria]] granted Humboldt Mexican citizenship<ref>Jaime Labastida. ''Humboldt: ciudadano universal''. Editorial Siglo XXI. México. 1999. p. xviii.</ref> and in 1859, the President of Mexico, [[Benito Juárez]], named Humboldt a hero of the nation (''benemérito de la nación'').<ref>Labastida, ''Humboldt'', p. xviii.</ref> The gestures were purely honorary; he never returned to the Americas following his expedition.

Importantly for Humboldt's long-term financial stability, King [[Frederick William III of Prussia]] conferred upon him the honor of the post of royal chamberlain, without at the time exacting the duties. The appointment had a pension of 2,500 [[thaler]]s, afterwards doubled. This official stipend became his main source of income in later years when he exhausted his fortune on the publications of his research. Financial necessity forced his permanent relocation to Berlin in 1827 from Paris. In Paris he found not only scientific sympathy, but the social stimulus which his vigorous and healthy mind eagerly craved. He was equally in his element as the lion of the [[Salon (gathering)|salon]]s and as the savant of the [[Institut de France]] and the observatory.

[[File:Gedenktafel Karolinenstr 19 (Tegel) Alexander von Humboldt.jpg|thumb|Memorial plaque, Alexander von Humboldt, Karolinenstraße 19, Berlin-Tegel, Germany]]
On 12 May 1827 he settled permanently in Berlin, where his first efforts were directed towards the furtherance of the science of terrestrial magnetism. In 1827, he began giving public lectures in Berlin, which became the basis for his last major publication, [[Kosmos (Humboldt)|''Kosmos'']] (1845–62).{{Sfn|Humboldt chronology|p= lxix}}

For many years, it had been one of his favorite schemes to secure, by means of simultaneous observations at distant points, a thorough investigation of the nature and law of "[[magnetic storm]]s" (a term invented by him to designate abnormal disturbances of [[Earth's magnetic field|Earth's magnetism]]). The meeting at Berlin, on 18 September 1828, of a newly formed scientific association, of which he was elected president, gave him the opportunity of setting on foot an extensive system of research in combination with his diligent personal observations. His appeal to the Russian government, in 1829, led to the establishment of a line of magnetic and meteorological stations across northern Asia. Meanwhile, his letter to the [[Prince Augustus Frederick, Duke of Sussex|Duke of Sussex]], then (April 1836) president of the Royal Society, secured for the undertaking, the wide basis of the [[British Empire|British dominions]].

The [[Encyclopædia Britannica Eleventh Edition|''Encyclopædia Britannica'', Eleventh Edition]], observes, "Thus that scientific conspiracy of nations which is one of the noblest fruits of modern civilization was by his exertions first successfully organized".{{sfn|Clerke|1911|p=874}} However, earlier examples of international scientific cooperation exist, notably the 18th-century observations of the [[Transit of Venus|transits of Venus]].

In 1856, U.S. diplomat [[John Bigelow]] published ''Memoir of the Life and Public Services of [[John Charles Fremont]]''. He dedicated it "To Alexander von Humboldt, this memoir of one whose genius he was among the first to discover and acknowledge, is respectfully inscribed by The Author."<ref>Bigelow, John. ''Memoir of the Life and Public Services of John Charles Fremont''. New York: Derby & Jackson, 1856, Dedication page.</ref>

In 1869, the 100th year of his birth, Humboldt's fame was so great that cities all over America celebrated his birth with large festivals. In New York City, a bust of his head was unveiled in [[Central Park]].<ref name="Nichols, Sandra 2006">Nichols, Sandra. "Why Was Humboldt Forgotten in the United States?" Geographical Review 96, no. 3 (July 2006): 399–415. Accessed July 4, 2016.</ref>

Scholars have speculated about the reasons for Humboldt's declining renown among the public. Sandra Nichols has argued that there are three reasons for this:
*First, a trend towards specialization in scholarship. Humboldt was a generalist who connected many disciplines in his work. Today, academics have become more and more focused on narrow fields of work. Humboldt combined [[ecology]], geography and even social sciences. 
*Second, a change in writing style. Humboldt's works, which were considered essential to a library in 1869, had flowery prose that fell out of fashion. One critic said they had a "laborious picturesqueness". Humboldt himself said that, "If I only knew how to describe adequately how and what I felt, I might, after this long journey of mine, really be able to give happiness to people. The disjointed life I lead makes me hardly certain of my way of writing".
*Third, a rising anti-German sentiment in the late 1800s and the early 1900s due to heavy German immigration to the United States and later World War 1.<ref name="Nichols, Sandra 2006"/> On the eve of the 1959 hundredth anniversary of the death of Humboldt, the government of West Germany planned significant celebrations in conjunction with nations that Humboldt visited.<ref>{{ill|Adolf Meyer-Abich|de}}, "The Hundredth Anniversary of the Death of Alexander von Humboldt", ''[[The Hispanic American Historical Review]]'', vol. 38, no. 3, (August 1958), pp. 394–396.</ref>

==Expedition in Russia, 1829==

[[File:Humboldt RUS.jpg|thumb|upright=1.75|Map of Humboldt's expedition to Russia in 1829]]
In 1811, and again in 1818, projects of Asiatic exploration were proposed to Humboldt, first by Tsar [[Nicholas I of Russia|Nicholas I]]'s Russian government, and afterwards by the Prussian government; but on each occasion, untoward circumstances interposed. It was not until he had begun his sixtieth year that he resumed his early role of traveler in the interests of science.

The Russian Finance Minister, Count [[Georg von Cancrin]], contacted Humboldt about whether a [[platinum]]-based currency was possible in Russia and invited him to visit the Ural Mountains. Humboldt was not encouraging about a platinum-based currency, when [[silver]] was the standard as a world currency. But the invitation to visit the Urals was intriguing, especially since Humboldt had long dreamed of going to Asia. He had wanted to travel to [[India]] and made considerable efforts to persuade the [[British East India Company]] to authorize a trip, but those efforts were fruitless.{{sfn|Wulf|2015|pp=171–174, 199–200}}

When Russia renewed its earlier invitation to Humboldt, he accepted.{{sfn|Wulf|2015|pp=199–200}} The Russians sought to entice Humboldt by engaging his enduring interest in mining sites, for comparative scientific purposes for Humboldt, but for the Russians to gain expert knowledge about their resources. For Humboldt, the Russian monarch's promise to fund the trip was extremely important, since Humboldt's inherited 100,000 thaler fortune was gone and he lived on the Prussian government pension of 2,500–3,000 thalers as the monarch's chamberlain. The Russian government gave an advance of 1200 {{transliteration|ru|chervontsev}} in Berlin and another 20,000 when he arrived in [[Saint Petersburg]].<ref name="Engelhardt60">{{cite book|last=Engelhardt|first=Mikhail Alexandrovich|author-link=:ru:Энгельгардт, Михаил Александрович|script-title=ru:Александр Гумбольдт. Его жизнь, путешествия и научная деятельность|trans-title=Alexander Humboldt: His Life, Travels and Scientific Activity|location=Saint Petersburg|publisher=Tip. Tovarishchestva obshchestvennaia Pol'za|year=1900|page=60}}</ref>

Humboldt was eager to travel not just to the Urals, but also across the steppes of Siberia to Russia's border with China. Humboldt wrote Cancrin saying that he intended to learn Russian to read mining journals in the language.{{sfn|de Terra|1955|pp=283–285}} As the details of the expedition were worked out, Humboldt said that he would travel to Russia in his own French coach, with a German servant, as well as [[Gustav Rose]], a professor of chemistry and mineralogy. He also invited [[Christian Gottfried Ehrenberg]] to join the expedition, to study water micro-organisms in [[Lake Baikal]] and the [[Caspian Sea]]. Humboldt himself was keen to continue his studies of magnetism of mountains and mineral deposits. As was usual for his research, he brought scientific instruments to take the most accurate measurements.{{sfn|de Terra|1955|p=287}} The Russians organized the local arrangements, including lodging, horses, accompanying crew. Humboldt's title for the expedition was as an official of the Department of Mines. As the expedition neared dangerous areas, he had to travel in a convoy with an escort.<ref name="Engelhardt60" />

Physically Humboldt was in good condition, despite his advancing years, writing to Cancrin "I still walk very lightly on foot, nine to ten hours without resting, despite my age and my white hair".<ref>Humboldt to Cancrin, quoted in {{harvnb|de Terra|1955|p=286}}.</ref>

[[File:Img079.jpg|thumb|upright=0.7|1959 postage stamp from the Soviet Union]]
Between May and November 1829 he and the growing expedition traversed the wide expanse of the Russian empire from the [[Neva]] to the [[Yenisei]], accomplishing in twenty-five weeks a distance of {{convert|9614|mi|km}}. Humboldt and the expedition party travelled by coach on well maintained roads, with rapid progress being made because of changes of horses at way stations. The party had grown, with Johann Seifert, who was a huntsman and collector of animal specimens; a Russian mining official; Count Adolphe Polier, one of Humboldt's friends from Paris; a cook; plus a contingent of [[Cossacks]] for security. Three carriages were filled with people, supplies, and scientific instruments. For Humboldt's magnetic readings to be accurate, they carried an iron-free tent.{{sfn|Wulf|2015|pp=201–202}} This expedition was unlike his Spanish American travels with Bonpland, with the two alone and sometimes accompanied by local guides.
The Russian government was interested in Humboldt's finding prospects for mining and commercial advancement of the realm and made it clear that Humboldt was not to investigate social issues, nor criticize social conditions of Russian [[serfs]]. In his publications on Spanish America, he did comment on the conditions of the indigenous populations, and deplored black slavery, but well after he had left those territories.{{sfn|Wulf|2015|p=205}} As Humboldt discovered, the government kept tight control of the expedition, even when it was {{convert|1000|mi}} from Moscow, with local government officials greeting the expedition at every stop. The itinerary was planned with [[Tobolsk]] the farthest destination, then a return to Saint Petersburg.

Humboldt wrote to the Russian Minister Cancrin that he was extending his travel, knowing that the missive would not reach him in time to scuttle the plan. The further east he journeyed into wilder territory, the more Humboldt enjoyed it. They still followed the Siberian Highway and made excellent progress, sometimes a hundred miles (160&nbsp;km) in a day.{{sfn|Wulf|2015|pp=206–207}} Although they were halted at the end of July and warned of an [[anthrax]] outbreak, Humboldt decided to continue despite the danger. "At my age, nothing should be postponed".<ref>quoted in {{harvnb|Wulf|2015|p=207}}.</ref>

The journey though carried out with all the advantages afforded by the immediate patronage of the Russian government, was too rapid to be profitable scientifically. The correction of the prevalent exaggerated estimate of the height of the Central Asian plateau, and the prediction of the discovery of diamonds in the gold-washings of the Urals, were important aspects of these travels. In the end, the expedition took 8 months, travelled 15,500&nbsp;km, stopped at 658 post stations, and used 12,244 horses.{{sfn|Engelhardt|1900|p=62}}

One writer claims that "Nothing was quite as Humboldt wanted it. The entire expedition was a compromise."{{sfn|Wulf|2015|p=203}} The Russian emperor offered Humboldt an invitation to return to Russia, but Humboldt declined, due to his disapproval of Nicholas's restrictions on his freedom of movement during the expedition and his ability to freely report on it.{{sfn|de Terra|1955|p=306}} Humboldt published two works on the Russian expedition, first {{lang|fr|Fragments de géologie et de climatologie asiatiques}} in 1831, based on lectures he gave on the topic. In 1843, he completed the three-volume ''Asie Centrale'',<ref>Alexander von Humboldt, ''Asie centrale, recherches sur les chaînes des montagnes et la climotologie comparée''. 3 vols. 1843.</ref> which he dedicated to Tsar Nicholas, which he called "an unavoidable step, as the expedition was accomplished at his expense".<ref>quoted in {{harvnb|de Terra|1955|p=307}}.</ref> As of 2016, these works have not been translated to English.{{sfn|Wulf|2015|p=433}} His 1829 expedition to Russia when he was an old man is much less known than his five-year travels in Spanish America, which had resulted in many published volumes over the decades since his 1804 return. Nevertheless, it gave Humboldt comparative data for his various later scientific publications.

==Works==
===''Cosmos''===
{{see also|Cosmos (Humboldt book)}}
[[File:Alexander von Humboldt photo 1857.jpg|thumb|left|upright|Photograph of Humboldt in his later years]]

''[[Cosmos (Humboldt book)|Kosmos]]'' was Humboldt's multi-volume effort in his later years to write a work bringing together all the research from his long career. The writing took shape in [[public lecture|lecture]]s he delivered before the [[Humboldt University of Berlin|University of Berlin]] in the winter of 1827–28. These lectures would form "the [[cartoon]] for the great fresco of the ''[K]osmos''".<ref>Quoted in {{harvnb|Dickinson|Howarth|1933|p=145}}</ref> His 1829 expedition to Russia supplied him with data comparative to his Latin American expedition.{{sfn|Wulf|2015|p=235}}

The first two volumes of the ''Kosmos'' were published between the years 1845 and 1847 and were intended to comprise the entire work, but Humboldt published three more volumes, one of which was posthumous. Humboldt had long aimed to write a comprehensive work about geography and the natural sciences. The work attempted to unify the sciences then known in a Kantian framework. With inspiration from [[German Romanticism]], Humboldt sought to create a compendium of the world's environment.<ref name="Walls 2009 3–15"/> He spent the last decade of his long life—as he called them, his "improbable" years—continuing this work. The third and fourth volumes were published in 1850–58; a fragment of a fifth appeared posthumously in 1862.

His reputation had long since been made with his publications on the Spanish American expedition. There is not a consensus on the importance of ''Kosmos''. One scholar, who stresses the importance of Humboldt's ''Political Essay on the Kingdom of New Spain'' as essential reading, dismisses ''Kosmos'' as "little more than an academic curiosity".{{sfn|Brading|1991|p=534}} A different opinion is that ''Kosmos'' was his "most influential book".{{sfn|Wulf|2015|p=235}}
[[File:Von Humboldt-4.jpg|alt=First page of the table of contents to volume 1 of "Cosmos," translated by Elise Otté (1849)|thumb|237x237px|First page of the table of contents to volume 1 of "Cosmos," translated by [[Elise Otté]] (1849)]]
As with most of Humboldt's works, ''Kosmos'' was also translated into multiple languages in editions of uneven quality. It was very popular in Britain and America. In 1849 a German newspaper commented that in England two of the three different translations were made by women, "while in Germany most of the men do not understand it".<ref>Supplement to No. 102 of ''[[Allgemeine Zeitung]]'' (Augsburg), 12 April 1849.</ref> The first translation by Augustin Pritchard—published anonymously by Mr. Baillière (volume I in 1845 and volume II in 1848)—suffered from being hurriedly made. In a letter Humboldt said of it: "It will damage my reputation. All the charm of my description is destroyed by an English sounding like Sanskrit."{{citation needed|date=June 2015}}

The other two translations were made by [[Elizabeth Juliana Leeves Sabine]] under the superintendence of her husband Col. [[Edward Sabine]] (4 volumes 1846–1858), and by [[Elise Otté]] (5 volumes 1849–1858, the only complete translation of the 4 German volumes). These three translations were also published in the United States. The numbering of the volumes differs between the German and the English editions. Volume 3 of the German edition corresponds to the volumes 3 and 4 of the English translation, as the German volume appeared in 2 parts in 1850 and 1851. Volume 5 of the German edition was not translated until 1981, again by a woman.<ref>{{Cite book|first=Margarita |last=Bowen|title=Empiricism and Geographical Thought: From Francis Bacon to Alexander von Humboldt|series=Cambridge Geographical Studies (No. 15)|place=Cambridge|publisher=Cambridge University Press|year=1981|isbn=978-0-521-10559-0}}</ref> Otté's translation benefited from a detailed table of contents, and an index for every volume; of the German edition only volumes 4 and 5 had (extremely short) tables of contents, and the index to the whole work only appeared with volume 5 in 1862. Less well known in Germany is the atlas belonging to the German edition of the Cosmos ''"Berghaus' Physikalischer Atlas"'', better known as the pirated version by Traugott Bromme under the title ''"Atlas zu Alexander von Humboldt's Kosmos"'' (Stuttgart 1861).{{citation needed|date=July 2015}}

In Britain, [[Heinrich Berghaus]] planned to publish together with [[Alexander Keith Johnston (1804–1871)|Alexander Keith Johnston]] a ''"Physical Atlas"''. But later Johnston published it alone under the title ''"The Physical Atlas of Natural Phenomena"''. In Britain its connection to the ''Cosmos'' seems not have been recognized.<ref>all information from Wolf-Dieter Grün: The English editions of the ''Kosmos''. Lecture at ''Alexander von Humboldt. Science in Britain and Germany during his lifetime''. Joint symposium of the Royal Society and the [[German Historical Institute London]], 1 October 1983.</ref>

===Other publications===
[[File:Muisca_cyphers_acc_acosta_humboldt_zerda.svg|upright=1.5|thumb|[[Muisca numerals]] as noted by Humboldt]]
Alexander von Humboldt published prolifically throughout his life. Many works were published originally in French or German, then translated to other languages, sometimes with competing translation editions. Humboldt himself did not keep track of all the various editions.{{sfn|Wulf|2015|p=413}} He wrote specialized works on particular topics of botany, zoology, astronomy, mineralogy, among others, but he also wrote general works that attracted a wide readership, especially his ''Personal Narrative of Travels to the Equinoctial Regions of the New Continent during the years 1799–1804''.<ref>[https://www.biodiversitylibrary.org/bibliography/23548 ''Personal narrative of travels to the equinoctial regions of America, during the years 1799–1804/ by Alexander von Humboldt and Aimé Bonpland; translated from the French of Alexander von Humboldt and edited by Thomasina Ross'' (vols 2 & 3)] {{Webarchive|url=https://web.archive.org/web/20170904232633/http://www.biodiversitylibrary.org/bibliography/23548 |date=2017-09-04 }}, biodiversitylibrary.org</ref> His ''Political Essay on the Kingdom of New Spain'' was widely read in Mexico itself, the United States, as well as in Europe.<ref>[https://www.biodiversitylibrary.org/item/85282#page/12/mode/1up ''Political essay on the kingdom of New Spain containing researches relative to the geography of Mexico''] {{Webarchive|url=https://web.archive.org/web/20170904203353/http://www.biodiversitylibrary.org/item/85282#page/12/mode/1up |date=2017-09-04 }}, biodiversitylibrary.org</ref>

Many of the original works have been digitally scanned by the Biodiversity Heritage Library.<ref>{{cite web|url=https://www.biodiversitylibrary.org|title=Biodiversity Heritage Library|website=Biodiversitylibrary.org|access-date=9 April 2018|archive-date=23 February 2011|archive-url=https://web.archive.org/web/20110223001438/http://biodiversitylibrary.org/|url-status=live}}</ref> There have been new editions of print works, including his ''Views of the Cordilleras and Monuments of the Indigenous Peoples of the Americas'' (2014), which includes reproductions of all the color and black and white plates. In the original edition, the publication was in a large format and quite expensive.{{sfn|Kutzinski|Ette|2012}} There is a 2009 translation of his ''Geography of Plants''<ref>Alexander von Humboldt, ''Geography of Plants'', translated by Sylvie Romanowski. Chicago: University of Chicago Press 2009.</ref> and a 2014 English edition of ''Views of Nature''.<ref>Alexander von Humboldt, ''Views of Nature'', Stephen T. Jackson, ed. Chicago: University of Chicago Press 2014. {{ISBN|978-022-6923185}}.</ref>

==Influence on scientists and artists==
[[File:Pickersgill humboldt.jpg|thumb|upright|Humboldt, portrait by [[Henry William Pickersgill]] (1831)]]
Humboldt was generous toward his friends and mentored young scientists. He and Bonpland parted ways after their return to Europe, and Humboldt largely took on the task of publishing the results of their Latin American expedition at Humboldt's expense, but he included Bonpland as co-author on the nearly 30 published volumes. Bonpland returned to Latin America, settling in Buenos Aires, Argentina, then moved to the countryside near the border with [[Paraguay]]. The forces of Dr. [[José Gaspar Rodríguez de Francia]], the strong man of Paraguay, abducted Bonpland after killing Bonpland's estate workers. Bonpland was accused of "agricultural espionage" and of threatening Paraguay's virtual monopoly on the cultivation of [[yerba mate]].

Despite international pressure, including the British government and Simón Bolívar's, along with European scientists including Humboldt, Francia kept Bonpland prisoner until 1831. He was released after nearly 10 years in Paraguay. Humboldt and Bonpland maintained a warm correspondence about science and politics until Bonpland's death in 1858.{{sfn|Wulf|2015|p=272}}

During Humboldt's time in Paris, he met in 1818 the young and brilliant Peruvian student of the Royal Mining School of Paris, [[Mariano Eduardo de Rivero y Ustariz]]. Subsequently, Humboldt acted as a mentor of the career of this promising Peruvian scientist. Another recipient of Humboldt's aid was [[Louis Agassiz]] (1807–1873), who was directly aided with needed cash from Humboldt, assistance in securing an academic position, and help with getting his research on zoology published. Agassiz sent him copies of his publications and went on to gain considerable scientific recognition as a professor at Harvard.{{sfn|de Terra|1955|pp=326–327}} Agassiz delivered an address to the Boston Society of Natural History in 1869, on the centenary of his patron's birth.<ref>Louis Agassiz, ''Address delivered on the Centennial Anniversary of the Birth of Alexander von Humboldt, under the auspices of the Boston Society of Natural History''. Boston 1869.</ref> When Humboldt was an elderly man, he aided another young scholar, [[Gotthold Eisenstein]], a brilliant, young, Jewish mathematician in Berlin, for whom he obtained a small crown pension and whom he nominated for the Academy of Science.{{sfn|de Terra|1955|pp=334–336}}

Humboldt's popular writings inspired many scientists and naturalists, including [[Charles Darwin]], [[Henry David Thoreau]], [[John Muir]], [[George Perkins Marsh]], [[Ernst Haeckel]],<ref>{{harvnb|Wulf|2015}}, chapters 17, 19, 21, 22, 23.</ref> [[Ida Laura Pfeiffer]]<ref>{{cite book |last1=Jehle |first1=Hiltgund |title=Ida Pfeiffer: Weltreisende im 19. Jahrhundert: Zur Kulturgeschichte reisender Frauen. |date=1989 |publisher=Waxman |location=Münster |isbn=9783893250202 |page=30 }}</ref> as well as brothers [[Richard Schomburgk|Richard]] and [[Robert Schomburgk|Robert Schomburgk{{sfn|Kutzinski|Ette|2012|p=xxiv}} and]] [[Robert von Schlagintweit|Robert]], [[Adolf Schlagintweit|Adolf]], and [[Hermann von Schlagintweit|Hermann Schlagintweit]].<ref>{{Cite journal |last=Finkelstein |first=Gabriel |date=2000 |title="'Conquerors of the Künlün'? The Schlagintweit Mission to High Asia, 1854–57" |url=https://adsabs.harvard.edu/full/2000HisSc..38..179F |journal=History of Science |volume=38, pt. 2 |issue=120 (June) |pages=179–218|doi=10.1177/007327530003800203 |bibcode=2000HisSc..38..179F }}</ref>

Humboldt carried on correspondence with many contemporaries and two volumes of letters to [[Karl August Varnhagen von Ense]] have been published.<ref>[https://www.biodiversitylibrary.org/item/79321 ''Letters of Alexander von Humboldt to Varnhagen von Ense. From 1827 to 1858. With extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt''. Tr. from the 2d German by Friedrich Kapp (ed.)] {{Webarchive|url=https://web.archive.org/web/20170727102304/http://www.biodiversitylibrary.org/item/79321 |date=2017-07-27 }}, biodiversitylibrary.org</ref><ref>[https://www.biodiversitylibrary.org/item/78470 ''Letters of Alexander von Humboldt written between the years 1827 and 1858 to Varnhagen von Ense together with extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt/ authorized translation from the German'' (with explanatory notes and a full index of names)] {{Webarchive|url=https://web.archive.org/web/20170727102309/http://www.biodiversitylibrary.org/item/78470 |date=2017-07-27 }}, biodiversitylibrary.org</ref>

Charles Darwin made frequent reference to Humboldt's work in his ''[[The Voyage of the Beagle|Voyage of the Beagle]]'', where Darwin described his own scientific exploration of the Americas. In one note, he placed Humboldt first on the "list of American travellers".<ref>Darwin, C. R. 1839. Narrative of the surveying voyages of His Majesty's Ships Adventure and Beagle between the years 1826 and 1836, describing their examination of the southern shores of South America, and the Beagle's circumnavigation of the globe. ''[[The Voyage of the Beagle|Journal and remarks]]''. 1832–1836. London: Henry Colburn. [http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F10.3&pageseq=129 p. 110] {{Webarchive|url=https://web.archive.org/web/20111129114043/http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F10.3&pageseq=129 |date=2011-11-29 }}</ref> Darwin's work was influenced by Humboldt's writing style as well. Darwin's sister remarked to him "you had, probably from reading so much of Humboldt, got his phraseology and the kind of flowery French expressions he uses".{{sfn|Wulf|2015|p=226}}

When Darwin's ''Journal'' was published, he sent a copy to Humboldt, who responded, "You told me in your kind letter that, when you were young, the manner in which I studied and depicted nature in the torrid zones contributed toward exciting in you the ardour and desire to travel in distant lands. Considering the importance of your work, Sir, this may be the greatest success that my humble work could bring."<ref>{{cite journal |last1=Barrett |first1=Paul H. |last2=Corcos |first2=Alain F. |last3=Humboldt |first3=Alexandre |title=A Letter from Alexander Humboldt to Charles Darwin |journal=Journal of the History of Medicine and Allied Sciences |date=April 1972 |volume=27 |issue=2 |page=163 |jstor=24622076 |url=https://www.jstor.org/stable/24622076 |access-date=22 June 2022}}</ref> In his autobiography, Darwin recalled, reading "with care and profound interest Humboldt's ''Personal Narrative''{{-"}} and finding it one of the two most influential books on his work, which stirred in him "a burning zeal to add even the most humble contribution to the noble structure of Natural Science".<ref>Barlow, Nora ed. 1958. ''The autobiography of Charles Darwin 1809–1882. With the original omissions restored. Edited and with appendix and notes by his granddaughter Nora Barlow''. London: Collins. [http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F1497&pageseq=69 pp. 67–68] {{Webarchive|url=https://web.archive.org/web/20081206010035/http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F1497&pageseq=69 |date=2008-12-06 }}</ref>

Humboldt would later reveal to Darwin in the 1840s that he had been deeply interested in Darwin's grandfather's poetry. [[Erasmus Darwin]] had published the poem [[The Botanic Garden|''The Loves of the Plants'']] in the early 1800s. Humboldt praised the poem for combining nature and imagination, a theme that permeated Humboldt's own work.{{sfn|Wulf|2015|p=37}}

[[File:Church Heart of the Andes.jpg|thumb|[[Frederic Edwin Church]], ''[[The Heart of the Andes]]'' (1859)]]
A number of nineteenth-century artists travelled to Latin America, following in the footsteps of Humboldt, painting landscapes and scenes of everyday life. [[Johann Moritz Rugendas]], [[Ferdinand Bellermann]], and [[Eduard Hildebrandt]] were three important European painters.<ref>Sigrid Achenbach. ''Kunst um Humboldt: Reisestudiern aus Mittel- un Südamerika von Rugendas, Bellerman un Hildebrandt im Berliner Kupferstichkabinett''. Berlin: Kupferstichkabinett Statliche Musee 2009.</ref> [[Frederic Edwin Church]] was the most famous landscape painter in the U.S. in the nineteenth century. His paintings of Andean volcanoes that Humboldt climbed helped make Church's reputation. His 5 foot by 10 foot painting entitled ''[[The Heart of the Andes]]'' "caused a sensation" when it was completed. Church had hoped to ship the painting to Berlin to show the painting to Humboldt, but Humboldt died a few days after Church's letter was written.<ref>{{harvnb|Wulf|2015}}, caption, [plate 11].</ref><ref>Frank Baron, "From Alexander von Humboldt to Frederic Edwin Church: Voyages of Scientific Exploration and Artistic Creativity". ''HiN'' VI, vol. 10, 2005.</ref><ref>Franklin Kelly, ed. ''Frederic Edwin Church''. Washington, D.C.: National Gallery of Art, Smithsonian Institution Press 1989.</ref><ref>Kevin J. Avery, ''In the Heart of the Andes: Church's Great Picture''. New York: Metropolitan Museum of Art 1993.</ref> Church painted [[Cotopaxi]] three times, twice in 1855 and then in 1859 in eruption.

[[George Catlin]], most famous for his portraits of North American Indians and paintings of life among various North American tribes, also travelled to South America, producing a number of paintings. He wrote to Humboldt in 1855, sending him his proposal for South American travels. Humboldt replied, thanking him and sending a memorandum helping guide his travels.<ref>George Catlin, ''Last Rambles Amongst the Indians of the Rocky Mountains and the Andes''. New York: D. Appleton & Co. 1867, pp. 332–333.</ref><ref>''South American Indian paintings by George Catlin''. Washington, D.C.: National Gallery of Art (U.S.) 1992.</ref>

[[Ida Laura Pfeiffer]], one of the first female travelers who completed two trips around the world from 1846 to 1855, followed in Humboldt's footsteps. The two explorers met in Berlin in 1851 before Pfeiffer's second tour and again in 1855 when she returned to Europe. Humboldt provided Pfeiffer with an open letter of introduction in which he bade anyone who knew of his name to assist Madame Pfeiffer for her "inextinguishable energy of character which she has everywhere shown, to wheresoever's she has been called or better put, driven by her unconquerable passion to study nature and man."<ref>{{cite book |last1=Pfeiffer |first1=Ida |title=The Last Travels of Ida Pfeiffer, inclusive a visit to Madagaskar |date=1861 |publisher=Routledge, Warne and Routledge. |location=London |page=x |url=https://archive.org/details/lasttravelsofida00pfeiuoft}}</ref>

==Other aspects of Humboldt's life and career==

===Humboldt and the Prussian monarchy===
[[File:AlexanderVonHumboldtBriefsiegel.jpg|thumb|upright|Humboldt's [[Seal (emblem)|seal]] on a private letter]]

In the Napoleonic wars, Prussia had capitulated to France, signing the [[Treaty of Tilsit]]. The Prussian royal family returned to Berlin, but sought better terms of the treaty and [[Friedrich Wilhelm III]] commissioned his younger brother [[Prince Wilhelm of Prussia (1783–1851)|Prince Wilhelm]] with this. Friedrich Wilhelm III asked Alexander to be part of the mission, charged with introducing the prince to Paris society. This turn of events for Humboldt could not have been better, since he desired to live in Paris rather than Berlin.{{sfn|de Terra|1955|p=210}}

In 1814 Humboldt accompanied the allied sovereigns to London. Three years later he was summoned by the king of Prussia to attend him at the [[Congress of Aix-la-Chapelle (1818)|congress of Aachen]]. Again in the autumn of 1822 he accompanied the same monarch to the [[Congress of Verona]], proceeded thence with the royal party to Rome and Naples and returned to Paris in the spring of 1823. Humboldt had long regarded Paris as his true home. Thus, when at last he received from his sovereign a summons to join his court at Berlin, he obeyed reluctantly.

Between 1830 and 1848 Humboldt was frequently employed in diplomatic missions to the court of [[Louis-Philippe of France|King Louis Philippe]] of France, with whom he always maintained the most cordial personal relations. [[Charles X of France]] had been overthrown, with Louis-Philippe of the [[house of Orléans]] becoming king. Humboldt knew the family, and he was sent by the Prussian monarch to Paris to report on events to his monarch. He spent three years in France, from 1830 to 1833. His friends [[François Arago]] and [[François Guizot]], were appointed to posts in Louis-Philippe's government.{{sfn|de Terra|1955|p=311}}

Humboldt's brother, [[Wilhelm von Humboldt|Wilhelm]], died on 8 April 1835. Alexander lamented that he had lost half of himself with the death of his brother. Upon the accession of the crown prince [[Frederick William IV of Prussia|Frederick William IV]] in June 1840, Humboldt's favor at court increased. Indeed, the new king's craving for Humboldt's company became at times so importunate as to leave him only a few waking hours to work on his writing.

=== Representation of indigenous population ===
Humboldt's publications such as ''Personal Narrative of Travels to the Equinoctial Regions of the New Continent during the years 1799–1804'' originate from a time when colonialism was prevalent. Within recent academic publications, there are arguments for and against Humboldt's own imperial bias. Within the book ''Imperial Eyes'', [[Mary Louise Pratt|Pratt]] argues for an implicit imperial bias within Humboldt's writing.<ref name="Pratt-2008">{{Cite book|last=Pratt|first=Mary Louise|authorlink=Mary Louise Pratt|title=Imperial Eyes : Travel Writing and Transculturation|date=2008|publisher=Routledge|isbn=978-0-203-93293-3|edition=2nd|location=London|oclc=299750885|page={{page needed|date=May 2021}}}}</ref> While Humboldt financed his expedition to the Spanish colonies independently, the Spanish monarchy allowed him to travel to South America.<ref name="Pratt-2008" /> Due to unrest within the Spanish colonies in South America, the Spanish crown implemented liberal reforms which led to greater support of the Spanish monarchy within the lower class.<ref name="Pratt-2008" /> However, Pratt points out that the reforms created opposition towards the Spanish rule within the upper class as the declining control of the Spanish monarchy would result in the white South American elite losing their privileges.<ref name="Pratt-2008" /> When Humboldt wrote about the natural world within South America, he portrayed it as neutral and free of people: If the indigenous population was mentioned within Humboldt's writing, Pratt argues, they were only represented when they were beneficial for Europeans.<ref name="Pratt-2008" /> Others argue that Humboldt was a German Columbus, as he described a virginal country that could be used for commerce by Europeans.<ref name="Wilke-2011">{{Cite journal|last=Wilke|first=Sabine|date=2011|title=Von angezogenen Affen und angekleideten Männern in Baja California: Zu einer Bewertung der Schriften Alexander von Humboldts aus postkolonialer Sicht|jstor=41303732|journal=[[German Studies Review]]|volume=34|issue=2|pages=287–304|issn=0149-7952}}</ref>

Other scholars counter Pratt's argumentation and refer to the abolitionist and anti-colonialist standpoint that Humboldt represents within his writing. An example is Humboldt's descriptions of the South American colonies in which he critiqued Spanish colonial rule.<ref>{{Cite journal|last=Sachs|first=Aaron|date=2003|title=The Ultimate 'Other': Post-Colonialism and Alexander Von Humboldt's Ecological Relationship with Nature|jstor=3590683|journal=[[History and Theory]]|volume=42|issue=4|pages=111–135|doi=10.1046/j.1468-2303.2003.00261.x|issn=0018-2656}}</ref> His close relationship with Enlightenment values such as liberty and freedom led to his support of democracy and his subsequent support of the independence of South America.<ref name="Wulf 2015">{{harvnb|Wulf|2015|p={{page needed|date=May 2021}}}}</ref> In order to improve the material and political situation of the indigenous population, Humboldt included propositions within his writing that he also presented to the Spanish monarchy.<ref name="Wilke-2011" /> When witnessing a slave market, Humboldt was shocked by the treatment of black people which led him to become opposed to slavery and support the abolitionist movement throughout his life.<ref name="Wulf 2015" /> Within his descriptions in ''Personal Narratives'', Humboldt also included the answers that were given to him by indigenous people. Additionally, Lubrich{{who|date=May 2021}} argues that despite the colonial and orientalist notions of his writing, Humboldt did not recreate these stereotypes, but deconstructed them.<ref name="Wilke-2011" />

===Religion===
[[File:Baron Alexander von Humboldt by Julius Schrader 1859.jpg|thumb|upright|Portrait of Humboldt by [[Julius Schrader]], 1859. [[Metropolitan Museum of Art]]]]
Because Humboldt did not mention God in his work ''Cosmos'', and sometimes spoke unfavourably of religious attitudes, it was occasionally speculated that he was a [[materialism|materialist]] philosopher, or perhaps an [[atheist]].<ref>''[https://archive.org/stream/alexandlettersof00humbrich#page/n416/mode/1up Humboldt and the New Infidelity]'', article found in [[Friedrich Kapp]]'s ''[https://archive.org/details/alexandlettersof00humbrich Letters of Alexander von Humboldt to Varnhagen von Ense. From 1827 to 1858. With extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt]'' (1860).</ref> However, unlike irreligious figures such as [[Robert G. Ingersoll]], who went so far as to use Humboldtian science to campaign against religion,<ref>{{harvnb|Sachs|2006|loc=Ch. 3}}</ref> Humboldt himself denied imputations of atheism. In a letter to [[Karl August Varnhagen von Ense|Varnhagen von Ense]] he emphasized that he believed the world had indeed been created, writing of ''Cosmos'': "...'creation' and the 'created world' are never lost sight of in the book. And did I not, only eight months ago, in the French translation, say, in the plainest terms: 'It is this necessity of things, this occult but permanent connection, this periodical return in the progress, development of formation, phenomena, and events which constitute 'Nature' submissive to a controlling power?'"<ref>Humboldt, Alexander von. 1860. ''Letters of Alexander von Humboldt to Varnhagen von Ense''. Rudd & Carleton. p. 194</ref>

It has been argued that "although Humboldt emphasizes the basis of morality in the nature of man, he does acknowledge that a belief in God is linked directly to acts of virtue" and therefore "the dignity of man lies at the centre of Humboldt's religious thought".<ref>Garbooshian, Adrina Michelle. 2006. ''The Concept of Human Dignity in the French and American Enlightenments: Religion, Virtue, Liberty''. ProQuest, p. 305.{{ISBN?}}</ref>

Humboldt also believed firmly in an [[afterlife]].{{sfn|James|1913|p=58}} A letter he wrote to his friend Charlotte Hildebrand Diede states: "God constantly appoints the course of nature and of circumstances; so that, including his existence in an eternal future, the happiness of the individual does not perish, but on the contrary grows and increases."<ref>Wilhelm Humboldt (Freiherr von), Charlotte Hildebrand Diede, Catharine M. A. Couper (1849). ''[https://archive.org/stream/lettersofwilliam02humbuoft#page/n35/mode/2up Letters to a female friend: A complete ed., translated from the 2d German ed, Volume 2]''. J. Chapman, pp. 24–25</ref>

Humboldt remained distant of organized religion, typical of a Protestant in Germany relating to the Catholic Church; Humboldt held deep respect for the ideal side of religious belief and church life within human communities.{{sfn|James|1913|pp=56–58}} He differentiated between "negative" religions, and those "all positive religions [which] consist of three distinct parts—a code of morals which is nearly the same in all of them, and generally very pure; a geological chimera, and a myth or a little historical novel".<ref>[[Friedrich Kapp]]'s [https://archive.org/details/alexandlettersof00humbrich ''Letters of Alexander von Humboldt to Varnhagen von Ense. From 1827 to 1858. With extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt''] (1860). Cambridge University Press. pp. 25–26.</ref> In ''Cosmos'', he wrote about how rich geological descriptions were found in different religious traditions, and stated: "Christianity gradually diffused itself, and, wherever it was adopted as the religion of the state, it not only exercised a beneficial condition on the lower classes by inculcating the social freedom of mankind, but also expanded the views of men in their communion with Nature...this tendency to glorify the Deity in his works gave rise to a taste for natural observation."<ref>Wikisource. ''[[s:Page:Popular Science Monthly Volume 9.djvu/727|Popular Science Monthly Volume 9]]''. "Science and Religion as Allies"</ref>

Humboldt showed [[religious tolerance]] towards Judaism, and he criticized the political ''Jews Bill'', which was an initiative intended to establish legal discrimination against Jews. He called this an "abominable" law, since he hoped to see Jews being treated equally in society.<ref>{{harvnb|Sachs|2006|loc="Notes", p. 29}}</ref>

===Sociality===
[[File:Alexander_von_Humboldt_in_seiner_Bibliothek.jpg|thumb|Humboldt in his library in his apartment, [[Oranienburger Straße]], Berlin. Color lithograph based on a painting by [[Eduard Hildebrandt]]]]
Much of Humboldt's private life remains a mystery because he destroyed his private letters. While a gregarious personality, he may have harbored a sense of social alienation, which drove his passion for escape through travel.{{sfn|Sachs|2007|p=64}}

===Sexuality===

Humboldt never married: while he was friendly with a number of women, including [[Henriette Herz|Henriette]], the wife of his mentor Marcus Herz, his sister-in-law Caroline von Humboldt stated "nothing will ever have a great influence on Alexander that doesn't come through men".{{sfn|Wulf|2015|p=71}} He had many strong male friendships, and at times had romances with men.{{sfn|Sachs|2007|p=65}}

As a student he became infatuated with Wilhelm Gabriel Wegener, a theology student, penning a succession of letters expressing his "fervent love".{{sfn|Helferich|2004|p=8}} At 25 he met Reinhardt von Haeften (1772–1803), a 22-year-old lieutenant, with whom he lived and travelled for two years, and to whom he wrote in 1794: "I only live through you, my good precious Reinhardt". When von Haeften became engaged, Humboldt begged to remain living with him and his wife: "Even if you must refuse me, treat me coldly with disdain, I should still want to be with you... the love I have for you is not just friendship or brotherly love, it is veneration".{{sfn|Rupke|2008|pp=187–200}}

A traveling companion in the Americas for five years was [[Aimé Bonpland]], and in [[Quito]] in 1802 he met the Ecuadorian aristocrat Don [[Carlos Montúfar]], who travelled with Humboldt to Europe and lived with him. In France, Humboldt travelled and lived with the physicist and balloonist [[Joseph Louis Gay-Lussac]]. Later he had a deep friendship with the married French astronomer [[François Arago]], whom he met daily for 15 years.<ref>{{cite book |last=Pratt |first=Mary Louise |author-link=Mary Louise Pratt |title=Imperial Eyes: Travel Writing and Transculturation |publisher=Routledge |location=New York |year=1992 |isbn=0415438160 |page=256}}</ref>

Humboldt once wrote "I don't know sensual needs".{{sfn|Wulf|2015|p=71}} However, a pious travelling companion, [[Francisco José de Caldas]], accused him of frequenting houses in Quito where "impure love reigned", of making friends with "obscene dissolute youths", of giving vent to "shameful passions of his heart", and dropping him to travel with "Bonpland and his Adonis" [Montúfar].<ref>{{cite book |last=Aldrich |first=Robert F. |title=Colonialism and Homosexuality |publisher=Routledge |location=London |year=2003 |isbn=0415196159 |page=29}}</ref>

Humboldt inherited a significant fortune, but the expense of his travels, and most especially of publishing (thirty volumes in all), had by 1834 made him totally reliant on the pension of King Frederick William III.{{sfn|Walls|2009|p=109}} Although he preferred living in Paris, by 1836 the King had insisted he return to Germany. He lived with the Court at [[Sanssouci]], and latterly in Berlin, with his valet Seifert, who had accompanied him to Russia in 1829.{{sfn|de Terra|1955|p=363}}
[[File:SignaturAlexanderVonHumboldt.svg|thumb|right|Signature of Humboldt late in life, when his handwriting became increasingly difficult to read]]
Four years before his death, Humboldt executed a deed of gift transferring his entire estate to Seifert,{{sfn|Walls|2009|p=367}}{{sfn|Helferich|2004|p=312}} who had by then married and set up a household near Humboldt's apartment. Humboldt had become godfather to his daughter.{{sfn|de Terra|1955|p=317}} The scale of the bequest has always drawn speculation, especially as Seifert was some thirty years younger, and introducing lower class partners into households under the guise of servants was then a common practice.<ref>{{cite book |last=Hirschfeld |first=Magnus |author-link=Magnus Hirschfeld |title=Die Homosexualitat des Mannes und des Weibes |publisher=Louis Marcus |location=Berlin |year=1914 |page=500}}</ref>

In 1908, the sexual researcher [[Paul Näcke]] gathered reminiscences from homosexuals<ref>{{Cite journal |first=Havelock Henry |last=Ellis |author-link=Havelock Ellis |year=1927 |title=Sexual Inversion |journal=Studies in the Psychology of Sex |volume=2 |page=39 |url=http://www.gutenberg.org/files/13611/13611-h/13611-h.htm#2_Page_39 |access-date=2006-09-19 |archive-date=2018-09-07 |archive-url=https://web.archive.org/web/20180907113412/http://www.gutenberg.org/files/13611/13611-h/13611-h.htm#2_Page_39 |url-status=live }}</ref> including Humboldt's friend the botanist [[Carl Bolle (naturalist)|Carl Bolle]], then nearly 90 years old: some of the material was incorporated by [[Magnus Hirschfeld]] into his 1914 study ''Homosexuality in Men and Women''.<ref>{{cite book |last=Hirschfeld |first=Magnus |title=Die Homosexualitat des Mannes und des Weibes |publisher=Louis Marcus |location=Berlin |year=1914 |page=681}}</ref> However, speculations about Humboldt's private life and possible [[homosexuality]] continue to remain a fractious issue amongst scholars, particularly as earlier biographers had portrayed him as "a largely asexual, Christ-like Humboldt figure...suitable as a national idol".{{sfn|Rupke|2008|pp=195–197}}

===Illness and death===
On 24 February 1857, Humboldt suffered a minor [[stroke]], which passed without perceptible symptoms.{{sfn|Clerke|1911}} It was not until the winter of 1858–1859 that his strength began to decline; on 6 May 1859, he died peacefully in Berlin, aged 89. His last words were reported to be "How glorious these sunbeams are! They seem to call Earth to the Heavens!"<ref>quoted in {{harvnb|Wulf|2015|p=279}}.</ref> His remains were conveyed in state through the streets of Berlin, in a hearse drawn by six horses. Royal chamberlains led the cortège, each charged with carrying a pillow with Humboldt's medals and other decorations of honor. Humboldt's extended family, descendants of his brother Wilhelm, walked in the procession. Humboldt's coffin was received by the prince-regent at the door of the cathedral. He was interred at the family resting-place at [[Tegel]], alongside his brother Wilhelm and sister-in-law Caroline.{{sfn|de Terra|1955|pp=368–369}}

==Honours and namesakes==
The honours which had been showered on Humboldt during their life continued after his death. More species are named after Humboldt than after any other human being.<ref name="Paul-2017">{{Cite book|title=Drawdown: the most comprehensive plan ever proposed to reverse global warming|last=Paul|first=Hawken|year=2017|publisher=Penguin|isbn=978-1524704650|page=24|oclc=973159818|title-link=Drawdown (book)}}</ref> The first centenary of Humboldt's birth was celebrated on 14 September 1869, with great enthusiasm in both the New and Old Worlds. Numerous monuments were constructed in his honour, such as [[Humboldt Park (Chicago park)|Humboldt Park in Chicago]], planned that year and constructed shortly after the [[Great Chicago Fire|Chicago fire]]. Newly explored regions and species named after Humboldt, as discussed below, also stand as a measure of his wide fame and popularity.

"Scarcely was there a European order which Humboldt had not the right to wear", and "more than a hundred and fifty societies to which he had been elected". These included "the most celebrated Academies of the leading nations of Europe and America, and not merely those of a purely scientific character, but any which had for their object the spread of education and the advancement of civilisation." Additionally, he was at least an honorary member of academies and learned societies throughout Europe and America and "was invested with the degree of Doctor in three faculties".{{sfn|Bruhns|1873|p=[https://babel.hathitrust.org/cgi/pt?id=uc2.ark:/13960/t5m903z33&view=1up&seq=398&skin=2021 382] {{LOC-general}}}}

===Honours===
* 1827 [[Honorary Doctor]] of the [[Imperial University of Dorpat]]<ref>{{cite web | url=https://ut.ee/et/sisu/audoktorid | title=Audoktorid &#124; Tartu Ülikool | date=11 September 2021 }}</ref>
* 1829: Actual Privy Counsellor, with the title of Excellency by King [[Frederick William III of Prussia]]{{sfn|Bruhns|1873|p=106}}
* 1842: Chancellor of the Order of Merit, an administrative position empowered to appoint, by King [[Frederick William IV of Prussia]]{{sfn|Bruhns|1873|p=282}}
* 1842: [[Pour le Mérite]], Recipient (civil division)<ref>{{cite book|last1=Lehmann|first1=Gustaf|title=Die Ritter des Ordens pour le mérite 1812–1913|year=1913|trans-title=The Knights of the Order of the Pour le Mérite|language=de|url=https://gdz.sub.uni-goettingen.de/id/PPN135808618|page=577|volume=2|location=Berlin|publisher=[[E.S. Mittler & Sohn|Ernst Siegfried Mittler & Sohn]]|access-date=2020-09-05|archive-date=2020-10-25|archive-url=https://web.archive.org/web/20201025211450/https://gdz.sub.uni-goettingen.de/id/PPN135808618|url-status=live}}</ref>
* 1844: [[Order of the Red Eagle]], by King [[Frederick William IV of Prussia]]{{sfn|Bruhns|1873|p=266}}
* 1847: [[Order of the Black Eagle]], by King [[Frederick William IV of Prussia]], the highest honour that was in the royal power to confer.{{sfn|Bruhns|1873|p=266}}
* 1850: Knight Grand Cross of the [[Order of Saints Maurice and Lazarus]]<ref>Handelsblad (Het) 14-08-1850</ref>
* 1852: [[Copley Medal]] "For his eminent services in terrestrial physics"{{sfn|Bruhns|1873|p=199}}
* 1853: [[Bavarian Maximilian Order for Science and Art]] by King [[Maximilian II of Bavaria]] "as the man who honours the order", "the hero of science in Germany".{{sfn|Bruhns|1873|p=294}}
* 1863: Knight Grand Cross of the [[Order of Guadalupe]]{{citation needed|date=August 2023}}

===Species named after Humboldt===
{{more citations needed section|date=February 2015}}
Humboldt described many geographical features and species that were hitherto unknown to Europeans. Species named after him include:
* ''Spheniscus humboldti'' – [[Humboldt penguin]]<!--citation needed-->
* ''Dosidicus gigas'' – [[Humboldt squid]]<!--citation needed-->
* ''[[Lilium humboldtii]]'' – Humboldt's lily<!--citation needed-->
* ''[[Phragmipedium humboldtii]]'' – an orchid<!--citation needed-->
* ''[[Quercus humboldtii]]'' – South American (Andean) oak<!--citation needed-->
* ''Conepatus humboldtii'' – [[Humboldt's hog-nosed skunk]]<ref>{{cite web|url=https://www.humboldt-foundation.de/en/explore/alexander-von-humboldt/a-name-to-conjure-with|title=A name to conjure with|publisher=The Humboldt Foundation|last=Wasmuth|first=Christopher}}</ref>
* ''[[Annona reticulata|Annona humboldtii]]'' – Neotropical fruit tree or shrub<!--citation needed-->
* ''[[Utricularia humboldtii]]'' – a bladderwort<!--citation needed-->
* ''[[Geranium humboldtii]]'' – a cranesbill<!--citation needed-->
* ''[[Salix humboldtiana]]'' – a South-American willow<ref>{{PLANTS|taxon=Salix humboldtiana Willd./ Humboldt's willow|symbol=SAHU|access-date=5 June 2012}}</ref>
* ''[[Boto|Inia geoffrensis humboldtiana]]'' – [[Amazon river dolphin]] subspecies of [[Orinoco River]] basin<!--citation needed-->
* ''[[Rhinocoryne humboldti]]'' – marine snail<!--citation needed-->
* ''[[Bathybembix humboldti]]'' – marine snail<!--citation needed-->
* ''[[Rhinella humboldti]]'' – Rivero's toad<!--citation needed-->
* ''[[Pteroglossus humboldti]]'' – Humboldt's Araçari<!--citation needed-->
* ''[[Hylocharis humboldtii]]'' – Humboldt's hummingbird<!--citation needed-->
* ''[[Casignethus humboldti]]'' – beetle<!--citation needed-->
* ''[[Elzunia humboldt]]'' – butterfly<!--citation needed-->
* †''[[Lenisambulatrix humboldti]]'' – Cambrian [[Lobopodia]]
* ''[[Squamulea humboldtiana]]'' – lichen<ref>{{cite journal |last1=Bungartz |first1=Frank |last2=Søchting |first2=Ulrik |last3=Arup |first3=Ulf |title=Teloschistaceae (lichenized Ascomycota) from the Galapagos Islands: a phylogenetic revision based on morphological, anatomical, chemical, and molecular data |journal=Plant and Fungal Systematics |volume=65 |issue=2 |year=2020 |doi=10.35535/pfsyst-2020-0030 |pages=515–576 |doi-access=free}}</ref>
* ''[[Eleutherodactylus humboldti|E. (S.) humboldti]]'' <ref>{{cite journal | last1=Devitt | first1=Thomas J. | last2=Tseng | first2=Karen | last3=Taylor-Adair | first3=Marlena | last4=Koganti | first4=Sannidhi | last5=Timugura | first5=Alice | last6=Cannatella | first6=David C. | title=Two new species of Eleutherodactylus from western and central Mexico ( Eleutherodactylus jamesdixoni sp. nov., Eleutherodactylus humboldti sp. nov.) | journal=PeerJ | volume=11 | date=2023-03-08 | issn=2167-8359 | pmid=36915652 | pmc=10007972 | doi=10.7717/peerj.14985 | doi-access=free | article-number=e14985}}</ref>

<gallery>
File:Spheniscus humboldti 20070116.jpg|[[Humboldt penguin]], native to Chile and Peru
File:Dosidicus gigas.jpg|[[Humboldt squid]] found in the [[Humboldt Current]]
File:Quercus humboldtii 1.JPG|[[Quercus humboldtii]], an Andean oak
</gallery>

===Geographical features named after Humboldt===
Features named after him include:<ref>{{harvnb|de Terra|1955|loc=Appendix D. "List of Geographic Features Named after Alexander von Humboldt", pp. 377–378.}}</ref>
{{div col|colwidth=30em}}
* [[Humboldt Bay (United States)|Humboldt Bay]] – Bay in Northern California, United States
* [[Humboldt Current]] – off the west coast of South America
* [[Humboldt Glacier]] – in North West Greenland
* [[Humboldt River]] and [[Humboldt Lake]] – Nevada, United States<ref>{{cite book | url=http://dwgateway.library.unr.edu/keck/histtopoNV/Origin_of_Place_Names_Files/1941NevadaOriginofNames-pt1.pdf | title=Origin of Place Names: Nevada | publisher=W.P.A. | author=Federal Writers' Project | year=1941 | pages=11 | access-date=2018-04-12 | archive-date=2018-11-13 | archive-url=https://web.archive.org/web/20181113062611/http://dwgateway.library.unr.edu/keck/histtopoNV/Origin_of_Place_Names_Files/1941NevadaOriginofNames-pt1.pdf | url-status=live }}</ref>
* [[Humboldt Peak (Colorado)]]{{snd}}4,287 m mountain in Custer County, Colorado, United States
* [[Pico Humboldt]]{{snd}}4,940 m mountain in Mérida, Venezuela
* [[Humboldt Sink]] – Dry lake bed in Nevada, United States
* [[East Humboldt Range|East]] and [[West Humboldt Range]] in Nevada, United States
* [[Sima Humboldt]] – sinkhole in Venezuela
* "Monumento Nacional Alejandro de Humboldt" at [[Caripe]], Venezuela
* [[Mount Humboldt]]{{snd}}1,617&nbsp;m (5,308&nbsp;ft), New Caledonia
* [[Humboldt Mountains (Antarctica)|Humboldt Mountains]], Antarctic mountains discovered and mapped by the [[Third German Antarctic Expedition]] (1938–1939)
* [[Humboldt Mountains (New Zealand)|Humboldt Mountains]] – Mountain Range in Fiordland National Park, New Zealand
* [[Humboldt Channel (Canada)|Humboldt Channel]] – natural waterway through the central Canadian Arctic Archipelago
* [[Humboldt Falls]]{{snd}}275 m Waterfall in Lower Hollyford Valley, Fiordland National Park, New Zealand
* [[Humboldt Redwoods State Park]] – in northern California, United States
{{div col end|2}}

<gallery>
Humboldt current.jpg|[[Humboldt Current]]
Pico Humboldt.jpg|[[Pico Humboldt]], Venezuela
</gallery>

===Places named after Humboldt===
The following places are named for Humboldt:
<!--please do not add any place here without a blue link to a Wikipedia article-->
{{div col|colwidth=30em}}
* [[Hacienda Humboldt]], Chihuahua, Mexico
* [[Humboldt, South Dakota]], United States
* [[Humboldt, Nebraska]], United States
* [[Humboldt, Illinois]], United States
* [[Humboldt, Iowa]], United States
* [[Humboldt, Tennessee]], United States
* [[Humboldt, Kansas]], United States
* [[Humboldt, Minnesota]], United States
* [[Humboldt, Arizona]], United States
* [[Humboldt County, California]], United States
* [[Fort Humboldt State Historic Park]], Eureka, California, United States
* [[Humboldt County, Nevada]], United States
* [[Humboldt County, Iowa]], United States
* [[Humboldt, Saskatchewan]], Canada
* [[Humboldt Park (Chicago park)|Humboldt Park]], Chicago, Illinois, United States
* [[Alejandro de Humboldt National Park]], Cuba
* [[Alexander von Humboldt National Forest]], Peru
* [[Humboldt-Toiyabe National Forest]], Nevada & California, United States<!--citation needed-->
* [[Martin Luther King Jr. Park|Humboldt Park]], Buffalo, New York, United States
* [[New York State Route 33#Kensington Expressway|Humboldt Parkway]], Buffalo, New York, United States
{{div col end|2}}

===Astronomical features===
* [[Mare Humboldtianum]] ([[lunar mare]])
* [[54 Alexandra]] ([[asteroid]])
* 4877 Humboldt (asteroid)

===Geological objects===
The mineral [[humboldtine]] was named for Alexander by [[Mariano Eduardo de Rivero y Ustariz|Mariano de Rivero]] in 1821.<ref>{{cite journal |last1=de Rivero |first1=Mariano |title=Note sur une combinaison de l'acide oxalique avec le fer trouvé à Kolowserux, près Belin en Bohéme |journal=Annales de Chimie et de Physique |date=1821 |volume=18 |pages=207–210}}</ref><ref>{{cite web |title=Humboldtine |url=https://www.mindat.org/min-1946.html |website=MinDat |access-date=15 September 2021}}</ref>

===Universities, colleges, and schools===
[[File:Huberlin-logo.svg|thumb|upright=0.5|Humboldt University of Berlin]]

====Universities====
* [[Humboldt University of Berlin]] is named after Alexander and his brother [[Wilhelm von Humboldt|Wilhelm]] who founded it<ref>{{cite web |url=http://www.hu-berlin.de/ueberblick-en/history/huben_html |title=Short History{{snd}}Humboldt–Universität zu Berlin |publisher=Hu-berlin.de |access-date=2013-10-31 |archive-date=2012-04-24 |archive-url=https://web.archive.org/web/20120424160357/http://www.hu-berlin.de/ueberblick-en/history/huben_html |url-status=live }}</ref>
* [[Alexander von Humboldt Biological Resources Research Institute]] in [[Bogotá]] and [[Villa de Leiva]], Colombia<!--citation needed-->
* [[California State Polytechnic University, Humboldt]] in [[Arcata, California]]
* [[Universidad Alejandro de Humboldt]] in Caracas, Venezuela

====Schools====
{{main|List of schools named after Alexander von Humboldt}}

<!--BLUELINKS ONLY with citations. For the "colegio": those are also primary and secondary schools; Spanish "colegio" usually means a school-->
* [[Alexander-von-Humboldt-Gymnasium, Konstanz]], Germany
* [[Alexander von Humboldt German International School Montreal]], Montreal, Canada
* [[Colegio Alemán Alexander von Humboldt (Mexico City)|Colegio Alemán Alexander von Humboldt]], Mexico City, Mexico
* [[Deutsche Schule Lima Alexander von Humboldt]], Lima, Peru
* [[Colegio Humboldt, Caracas|Colegio Humboldt]], Caracas, Venezuela
* [[Humboldt Senior High School]], St. Paul, Minnesota
<!--Please do not add anything except existing articles here, it will be removed-->

===Lecture series===
Alexander von Humboldt also lends his name to a prominent lecture series in [[Human geography]] in the Netherlands (hosted by the [[Radboud University Nijmegen]]). It is the Dutch equivalent of the widely known annual [[Alfred Hettner|Hettner]] lectures at the [[University of Heidelberg]].

===The Alexander von Humboldt Foundation===
After his death, Humboldt's friends and colleagues created the [[Alexander von Humboldt Foundation]] (''Stiftung'' in German) to continue his generous support of young academics. Although the original endowment was lost in the [[German hyperinflation of the 1920s]], and again as a result of World War II, the Foundation has been re-endowed by the German government to award young academics and distinguished senior academics from abroad. It plays an important role in attracting foreign researchers to work in Germany and enabling German researchers to work abroad for a period.

===Dedications===
[[Edgar Allan Poe]] dedicated his last major work, ''[[Eureka: A Prose Poem]]'', to Humboldt, "With Very Profound Respect". Humboldt's attempt to unify the sciences in his ''Kosmos'' was a major inspiration for Poe's project.

In 2019, [[Josefina Benedetti]] composed ''Humboldt'' an Orchestral Suite in five movements.

===Ships===
''[[Alexander von Humboldt (ship)|Alexander von Humboldt]]'' is also a German ship named after the scientist, originally built in 1906 by the German shipyard AG Weser at [[Bremen (city)|Bremen]] as '''''Reserve Sonderburg'''''. She was operated throughout the North and Baltic Seas until being retired in 1986. Subsequently, she was converted into a three-masted [[barque]] by the German shipyard Motorwerke Bremerhaven, and was re-launched in 1988 as ''Alexander von Humboldt''.{{citation needed|date=June 2015}}

The [[Jan De Nul Group]] operates a hopper dredger built in 1998 also named ''Alexander von Humboldt''.<ref>{{Cite web |url=https://www.jandenul.com/sites/default/files/equipment-item/pdfs/01.tshd_en_-_v2013-2_-_alexander_von_humboldt.pdf |title=Archived copy |access-date=2019-06-02 |archive-date=2019-12-12 |archive-url=https://web.archive.org/web/20191212160651/https://www.jandenul.com/sites/default/files/equipment-item/pdfs/01.tshd_en_-_v2013-2_-_alexander_von_humboldt.pdf |url-status=live }}</ref>

===Recognitions by contemporaries===

[[Simón Bolívar]] wrote that "The real discoverer of South America was Humboldt, since his work was more useful for our people than the work of all conquerors".<ref>Raymond Erickson, Mauricio A. Font, Brian Schwartz. [https://www.researchgate.net/publication/283269427_Alexander_von_Humboldt_From_the_Americas_to_the_Cosmos ''Alexander von Humboldt. From the Americas to the Cosmos''] {{Webarchive|url=https://web.archive.org/web/20180310010635/https://www.researchgate.net/publication/283269427_Alexander_von_Humboldt_From_the_Americas_to_the_Cosmos |date=2018-03-10 }} p. xvi. Bildner Center for Western Hemisphere Studies, The Graduate Center, The City University of New York</ref> [[Charles Darwin]] expressed his debt to Humboldt, and admiration for his work,<ref>Darwin Correspondence Project "[http://www.darwinproject.ac.uk/entry-9601 Letter 9601] {{Webarchive|url=https://web.archive.org/web/20121002181552/http://www.darwinproject.ac.uk/entry-9601 |date=2012-10-02 }} – Darwin, C. R. to secretary of New York Liberal Club", [after 13 Aug 1874]</ref> writing to [[Joseph Dalton Hooker]] that Humboldt was the "''greatest scientific traveller who ever lived''".<ref>Darwin Correspondence Project " [http://www.darwinproject.ac.uk/entry-13277 Letter 13277] {{Webarchive|url=https://web.archive.org/web/20121002181731/http://www.darwinproject.ac.uk/entry-13277 |date=2012-10-02 }} – Darwin, C. R. to Hooker, J. D., 6 Aug 1881</ref> <!-- source needed, possibly in Letter 9601? – "I have always admired him; now I worship him".--> [[Wilhelm von Humboldt]] wrote that "Alexander is destined to combine ideas and follow chains of thoughts which would otherwise have remained unknown for ages. His depth, his sharp mind and his incredible speed are a rare combination." [[Johann Wolfgang Goethe]] observed that "Humboldt showers us with true treasures". [[Friedrich Schiller]] wrote that "Alexander impresses many, particularly when compared to his brother—because he shows off more!" [[José de la Luz y Caballero]] wrote that "Columbus gave Europe a New World; Humboldt made it known in its physical, material, intellectual, and moral aspects".

[[Napoléon Bonaparte]] remarked "You have been studying Botanics? Just like my wife!" [[Claude Louis Berthollet]] said "This man is as knowledgeable as a whole academy". [[Thomas Jefferson]] remarked "I consider him the most important scientist whom I have met". [[Emil du Bois-Reymond]] wrote that "Every assiduous scholar ... is Humboldt's son; we are all his family."<ref>{{Cite book|title=Zwei grosse Naturforscher des 19. Jahrhunderts. Ein Briefwechsel zwischen Emil du Bois-Reymond und Karl Ludwig|publisher=Verlag von Johann Ambrosius Barth|year=1927|editor-last=du Bois-Reymond|editor-first=Estelle|location=Leipzig|page=61}}</ref> [[Robert G. Ingersoll]] wrote that "He was to science what Shakespeare was to the drama".<ref>''The Writings of Robert G Ingersoll'' (Dresden Edition), C. P. Farrell (1900)</ref>

[[Hermann von Helmholtz]] wrote that "During the first half of the present century we had an Alexander von Humboldt, who was able to scan the scientific knowledge of his time in its details, and to bring it within one vast generalization. At the present juncture, it is obviously very doubtful whether this task could be accomplished in a similar way, even by a mind with gifts so peculiarly suited for the purpose as Humboldt's was, and if all his time and work were devoted to the purpose."<ref>H. Helmholtz (1869), translated by E. Atkinson, ''The aim and progress of physical science'', in Popular Lectures on Scientific Subjects, 1873</ref>

===Sculptures===
<gallery heights="150">
File:Alejandrodehumboldt.jpg|Bust at the [[University of Havana]]
File:Alexander von Humboldt-Denkmal in der Budapester Str., Berlin - 1.jpg|[[Statue of Alexander von Humboldt (Bläser)|Statue in Budapester Straße, Berlin]]
File:Von Humboldt Statue.jpg|[[Statue of Alexander von Humboldt (Chicago)|Statue]] in [[Humboldt Park, Chicago]]
File:Alexander von Humboldt Statue in Allegheny West Park.jpg|Statue in [[Allegheny West (Pittsburgh)|Allegheny West]] Park, Pittsburgh, Pennsylvania
File:Alexander von Humboldt Denkmal - Humboldt Universität zu Berlin.jpg|[[Statue of Alexander von Humboldt (Begas)|Statue]] at [[Humboldt University of Berlin]], describing him as "the second discoverer of Cuba"
File:HumboldtCentralPark.jpg|[[List of sculptures in Central Park|Bust in Central Park]], New York
File:Monumento a Alexander Von Humboldt, Alameda Central, Ciudad de México.jpg|[[Statue of Alexander von Humboldt (Mexico City)|Statue]] in [[Alameda Central]], Mexico City
File:Humboldt_-_Cuernavaca_I.jpg|Statue of Humboldt in [[Cuernavaca]], [[Mexico]]
File:Alexander Humboldt statue, Quito, Ecuador.jpg|Monument in [[Parque El Ejido]], Quito, Ecuador
File:Estatua de Alexander Von Humboldt. Parque Nacional El Guácharo. Estado Monagas. Venezuela..JPG|Alexander Von Humboldt Statue. El Guácharo National Park. [[Monagas]] State. Venezuela
File:Standbild Heumarkt Köln - Alexander von Humboldt.jpg|Humboldt, part of [[:Commons:Category:Reiterstandbild Friedrich Wilhelm III in Köln|a sculpture]] in Cologne, Germany
File:Humboldt-statue-tower-grove-benecke.jpg|Statue in [[Tower Grove Park]], [[St. Louis]]{{sfn |Daum |1994 |pp=48-58 }}
File:Louis Agassiz and Alexander von Humboldt statues at Jordan Hall, Stanford.jpg|Louis Agassiz and Alexander von Humboldt statues at Jordan Hall, [[Stanford University]] main quad
File:Mirador Humboldt 01.jpg|The bronze sculpture by the artist Ana Lilia Martín, born in [[La Palma]] (Canarias) in 1963, depicts the natural scientist Alexander von Humboldt. The sculpture has been on the terrace of the Humboldblick viewpoint in [[La Orotava]] since 2009.
File:B Chimborazo W 0501 054 (16669362064).jpg|Sculpture in [[Chimborazo]], Ecuador
</gallery>

==Works==
===Scientific works===
{{div col|colwidth=30em}}
* ''Florae Fribergensis specimen plantas cryptogramicus praesertim subterraneas exhibens'', 1793. Humboldt's observations of underground plants made when he was a mining inspector.
* ''Versuche über die gereizte Muskel- und Nervenfaser nebst Versuchen über den chemischen Prozess des Lebens in der Thier- und Pflanzenwelt''. (2 volumes), 1797. Humboldt's experiments in galvanism and nerve conductivity.
* [https://books.google.com/books?id=NAJdttSLSxMC ''Ueber<!--[sic]--> die unterirdischen Gasarten und die Mittel, ihren Nachtheil zu vermindern'']. Braunschweig: Vieweg 1799.
* ''Sur l'analyse de l'air atmosphérique'', with J.L. Gay-Lussac. Paris 1805. German edition, Türbingen.
* ''Fragments de géologie et de climatologie asiatiques'' 2 vols. Paris, 1831; Tübingen, 1831
* ''Asie centrale, recherches sur les chaînes des montagnes et la climotologie comparée''. 3 vols. 1843

''Le voyage aux régions equinoxiales du Nouveau Continent, fait en 1799–1804, par Alexandre de Humboldt et Aimé Bonpland'' (Paris, 1807, etc.), consisted of thirty folio and quarto volumes, including:
* ''Vues des Cordillères et monuments des peuples indigènes de l'Amérique'' (2 vols. folio, 1810)
** English translation: [https://www.biodiversitylibrary.org/item/125538 ''Researches concerning the institutions & monuments of the ancient inhabitants of America : with descriptions & views of some of the most striking scenes in the Cordilleras!'' (2 vols.)] [exclamation point in the original title]
** English translation: ''Views of the Cordilleras and Monuments of the Indigenous Peoples of the Americas: A Critical Edition''. [[Vera Kutzinski|Vera M. Kutzinski]] and [[Ottmar Ette]], editors. Chicago: University of Chicago Press, 2014. {{ISBN|978-0-226-86506-5}}
* ''[https://archive.org/details/examencritiqued06humbgoog Examen critique de l'histoire de la géographie du Nouveau Continent]'' (4 vols. 1814–1834)
* ''Atlas géographique et physique du royaume de la Nouvelle Espagne'' (1811)
* [https://www.biodiversitylibrary.org/item/85270#page/8/mode/1up ''Essai politique sur le royaume de la Nouvelle Espagne''] (1811);
** English translation: [https://www.biodiversitylibrary.org/item/85282#page/12/mode/1up ''Political essay on the kingdom of New Spain containing researches relative to the geography of Mexico''], (1811) biodiversitylibrary.org;
* [https://www.biodiversitylibrary.org/item/37872 ''Essai sur la géographie des plantes: accompagné d'un tableau physique des régions équinoxiales, fondé sur des mesures exécutées, depuis le dixième degré de latitude boréale jusqu'au dixième degré de latitude australe, pendant les années 1799, 1800, 1801, 1802 et 1803/ par Al. de Humboldt et A. Bonpland; rédigée par Al. de Humboldt'' (1805)], biodiversitylibrary.org
** English translation by Sylvie Romanowski:''Essay on the Geography of Plants''. University of Chicago Press. (2009)
* ''Essai géognostique sur le gisement des roches dans les deux continents''. Paris 1823. English and German editions.
* ''Essai politique sur l'îsle de Cuba''. 2 vols. Paris 1828. English<ref>{{cite book |last1=Humboldt |first1=Alexander von |title=Political essay on the island of Cuba |date=2011 |publisher=University of Chicago Press |location=Chicago |isbn=9780226465678 |url=https://press.uchicago.edu/ucp/books/book/chicago/P/bo10285737.html |language=en}}</ref> and German editions.
* [https://www.biodiversitylibrary.org/item/95419 ''Relation historique du Voyage aux Régions équinoxiales du Nouveau Continent, etc.'' (1814–1825), an unfinished narrative of his travels, including the ''Essai politique sur l'île de Cuba''], biodiversitylibrary.org
* [http://cdm15121.contentdm.oclc.org/cdm4/document.php?CISOROOT=/p9016coll23&CISOPTR=1299&REC=4 ''Monographie des melastomacées'' (1833)]
* [https://www.biodiversitylibrary.org/bibliography/16027 ''Monographia Melastomacearum: continens plantas huius ordinis, hucusque collectas, praesertim per regnum Mexici, in provinciis Caracarum et Novae Andalusiae, in Peruvianorum, Quitensium, Novae Granatae Andibus, ad Orinoci, fluvii Nigri, fluminis Amazonum rupas nascentes''] (2 vols.)
* [https://www.biodiversitylibrary.org/bibliography/32462 ''Cosmos : a sketch of a physical description of the universe by Alexander von Humboldt; translated from the German by E. C. Otté''] (5 vols.)<ref>{{cite book|page=76|year=1860|access-date=May 17, 2014|publisher=Harper|first=Alexander von |last=Humboldt|translator= Elise C. Otté|title=Cosmos: A Sketch of a Physical Description of the Universe, Volume 4|url=https://books.google.com/books?id=hZY-AQAAIAAJ&q=ines+mongolian+spot&pg=PA76}}</ref>
* [https://www.biodiversitylibrary.org/bibliography/40012 ''Cosmos: essai d'une description physique du monde ''] (4 vols.)
* [https://www.biodiversitylibrary.org/bibliography/33954 ''Gesammelte Werke von Alexander von Humboldt'' ] (12 vols.)
* [https://www.biodiversitylibrary.org/item/23794 ''Ansichten der Natur: mit wissenschaftlichen Erläuterungen '']
* [https://www.biodiversitylibrary.org/item/101629 ''Aphorismen aus der chemischen Physiologie der Pflanzen. Aus dem Lateinischen übersetzt von Gotthelf Fischer. Nebst einigen Zusätzen von Herrn Dr. und Prof. Hedwig und einer Vorrede von Herrn Dr. und Prof. Christ. Friedr. Ludwig''.] 1794.
* [https://www.biodiversitylibrary.org/bibliography/45601 ''Aspects of nature, in different lands and different climates with scientific elucidations'']
* [https://www.biodiversitylibrary.org/item/89025#page/1/mode/1up ''Atlas zu Alex. v. Humboldt's Kosmos in zweiundvierzig Tafeln mit erläuterndem Texte / herausgegeben von Traugott Bromme'']
* [https://www.biodiversitylibrary.org/item/60882#page/7/mode/1up ''Briefe von Alexander von Humboldt an Varnhagen von Ense, aus den Jahren 1827 bis 1858 : nebst Auszügen aus Varnhagen's Tagebüchern und Briefen von Varnhagen und andern an Humboldt'']
* [https://www.biodiversitylibrary.org/item/37871#page/1/mode/1up ''Ideen zu einer Geographie der Pflanzen: nebst einem Naturgemälde der Tropenländer : auf Beobachtungen und Messungen gegründet, welche vom 10ten Grade nördlicher bis zum 10ten Grade südlicher Breite, in den Jahren 1799, 1800, 1801, 1802 und 1803 angestellt worden sind / von Al. von Humboldt und A. Bonpland; bearbeitet und herausgegeben von dem erstern'']
* [https://www.biodiversitylibrary.org/item/14437 ''An illustration of the genus Cinchona :comprising descriptions of all the officinal Peruvian barks, including several new species, Baron de Humboldt's Account of the Cinchona forests of South America, and Laubert's Memoir on the different species of quinquina: to which are added several dissertations of Don Hippolito Ruiz on various medicinal plants of South America ''] (1821);
* [https://www.biodiversitylibrary.org/bibliography/4717 ''Kosmos. Entwurf einer physischen Weltbeschreibung von Alexander von Humboldt''] (5 vols.)
* ''Des lignes isothermes et de la distribution de la châleur sur le globe''. Paris 1817. German edition, Türbingen.
* [https://www.biodiversitylibrary.org/bibliography/23548 ''Personal narrative of travels to the equinoctial regions of America, during the years 1799–1804/ by Alexander von Humboldt and Aimé Bonpland; translated from the French of Alexander von Humboldt and edited by Thomasina Ross'' (vols 2 & 3)], biodiversitylibrary.org
* ''Personal Narrative of Travels to the Equinoctial Regions of the New Continent''. 7 vols. London. First edition in French, Paris: 1815–26.
* [https://www.biodiversitylibrary.org/bibliography/25297 ''Viage âa las regiones equinocciales del nuevo continente: hecho en 1799 hasta 1804, por Al. de Humboldt y A. Bonpland; redactado por Alejandro de Humboldt; continuaciâon indispensable al ensayo polâitico sobre el reino de la Nueva Espaäna por el mismo autor'' (5 vols.)], 1826. biodiversitylibrary.org
* [https://www.biodiversitylibrary.org/item/109430 ''Pflanzengeographie, nach Alexander von Humboldt's Werke ueber<!--[sic]--> die geographische Vertheilhung der Gewächse: mit Anmerkungen, grösseren Beilagen aus andern pflanzengeographischen Schriften und einem Excurse über die bei pflanzengeographischen Floren-Vergleichungen nöthigen Rücksichten'']
* [https://www.biodiversitylibrary.org/bibliography/460 ''Plantes équinoxiales recueillies au Mexique :dans l'île de Cuba, dans les provinces de Caracas, de Cumana et de Barcelone, aux Andes de la Nouvelle Grenade, de Quito et du Pérou, et sur les bords du rio-Negro de Orénoque et de la rivière des Amazones'' (2 vols.)]
* [https://www.biodiversitylibrary.org/bibliography/43770 ''Recueil d'observations de zoologie et d'anatomie comparée : faites dans l'océan atlantique, dans l'intérieur du nouveau continent et dans la mer du sud pendant les années 1799, 1800, 1801, 1802 et 1803 / par Al. de Humboldt et A. Bonpland'' (2 vols.)]
* [https://www.biodiversitylibrary.org/item/73180 ''Reise in die Aequinoctial-Gegenden des neuen Continents in den Jahren 1799, 1800, 1801, 1803 und 1804'' (vol. 3)]
* [https://www.biodiversitylibrary.org/item/95419 ''Relation historique du voyage aux régions équinoxiales du nouveau continent, fait en 1799, 1800, 1801, 1802, 1803, et 1804'' (vol. 3)]
* [https://www.biodiversitylibrary.org/item/89305 ''Tableaux de la nature; ou, Considérations sur les déserts, sur le physionomie des végétaux, sur les cataractes de l'Orénoque, sur la structure et l'action des volcans dans les différentes régions de la terre'']<!-- year?? -->
* [https://www.biodiversitylibrary.org/item/24009 ''Views of nature, or, Contemplations on the sublime phenomena of creation : with scientific illustrations'' (1850)]
* [https://www.biodiversitylibrary.org/item/72102 ''Views of nature: or, Contemplations on the sublime phenomena of creation; with scientific illustrations'' (1884)]
{{div col end|2}}

===Other works===
* [https://www.biodiversitylibrary.org/item/79321 ''Letters of Alexander von Humboldt to Varnhagen von Ense. From 1827 to 1858. With extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt''. Tr. from the 2d German by Friedrich Kapp (ed.)], biodiversitylibrary.org
* [https://www.biodiversitylibrary.org/item/78470 ''Letters of Alexander von Humboldt written between the years 1827 and 1858 to Varnhagen von Ense together with extracts from Varnhagen's diaries, and letters of Varnhagen and others to Humboldt/ authorized translation from the German'' (with explanatory notes and a full index of names)], biodiversitylibrary.org
* [https://www.biodiversitylibrary.org/bibliography/640 ''Nova genera et species plantarum'' (7 vols. folio, 1815–1825), contains descriptions of above 4500 species of plants collected by Humboldt and Bonpland], was mainly compiled by [[Carl Sigismund Kunth]]; J. Oltmanns assisted in preparing the ''Recueil d'observations astronomiques'' (1808); Cuvier, Latreille, Valenciennes and Gay-Lussac cooperated in the ''Recueil d'observations de zoologie et d'anatomie comparée'' (1805–1833).<ref name="EB1911"/>

{{botanist|Humb.}}

==See also==
* [[History of biology]]
* [[History of geography]]
* [[Humboldtian science]]
* [[Peter Gustav Lejeune Dirichlet|Lejeune Dirichlet, Peter Gustav (1805–1859)]]
* [[List of explorers]]
* [[List of people from Berlin]]
* [[Johann Rudolph Rengger|Rengger, Johann Rudolph (1795–1832)]]
* [[Romanticism in science]]
*[[Cartopology]]

==Notes==
{{Notelist}}

==References==
{{Reflist}}

==Works cited==
{{Refbegin |30em |indent=yes}}
* {{cite book | last=Bleichmar | first = Daniela| title=Visible Empire: Botanical Expeditions and Visual Culture in the Hispanic Enlightenment | publisher=University of Chicago Press | location=Chicago London | year=2012 | isbn=978-0-226-05853-5 }}
* {{ cite book | last=Brading | first=David | author-link=David Brading | year=1991 | chapter=Chapter 23. Scientific Traveller | title=The First America : the Spanish Monarchy, Creole Patriots, and the Liberal State, 1492-1867 | location=New York | publisher=Cambridge University Press | isbn=0-521-39130-X }}
* {{cite book|editor-last=Bruhns|editor-first=Karl|editor-link=Karl Christian Bruhns|title=Life of Alexander von Humboldt|hdl=2027/uc2.ark:/13960/t5m903z33|volume=II|year=1873|translator=Jane and Caroline Lassell|publisher=Longmans, Green, and Co.|location=London}} {{PD-notice}}
*{{cite magazine  |last=Daum |first=Andreas W. |author-link=Andreas Daum |year=1994 |title=Celebrating Humanism in St. Louis: The Origins of the Humboldt Statue in Tower Grove Park, 1859‒1878
|magazine=Gateway Heritage: Quarterly Magazine of the Missouri Historical Society |issue=Fall 1994 |pages=48–58 }}
* {{cite journal |last=Daum |first=Andreas W. |author-link=Andreas Daum |date=March 2019 |title=Social Relations, Shared Practices, and Emotions: Alexander von Humboldt's Excursion into Literary Classicism and the Challenges to Science around 1800 |journal=[[The Journal of Modern History]] |doi=10.1086/701757 |publisher=University of Chicago |volume=91 |issue=1|pages=1–37 |s2cid=151051482 }}
* {{cite book |last=Daum |first=Andreas W. |author-link=Andreas Daum |year=2024a |title=Alexander von Humboldt: A Concise Biography |location=Trans. Robert Savage. Princeton, N.J. |publisher=Princeton University Press |isbn=978-0-691-24736-6 }}
* {{cite journal |last=Daum |first=Andreas W. |author-link=Andreas Daum |year=2024b |title=Humboldtian Science and Humboldt's Science |journal=[[History of Science]] |doi=10.1177/00732753241252478 |publisher=Sage |volume=63 |issue=1 |pages=29–51 |pmid=38770782 }}
* {{cite journal |last=Daum |first=Andreas W. |author-link=Andreas Daum |year=2025 |title=A 'Temple of Liberty'? Alexander von Humboldt and the French Revolution |journal=[[Annals of Science]] |doi=10.1080/00033790.2024.2433232 |publisher=Taylor & Francis |volume=82 |pages=1–26 |pmid=39655387 }}
* {{ cite book | last=de Terra | first=Helmut | author-link = Helmut de Terra |year=1955 | title=Humboldt: The Life and Times of Alexander von Humboldt, 1769–1859 | url=https://archive.org/details/humboldtthelifea000889mbp | location=New York | publisher=Alfred A. Knopf | oclc=902143803 }}
* {{cite book |last1=Dickinson|first1=Robert Eric |last2=Howarth |first2=O. J. R.|year=1933 |title=The Making of Geography |url=https://archive.org/details/makingofgeograph009224mbp |edition=online Universal Digital Library, facsimile of original |location=Oxford |publisher=Clarendon Press |oclc=9640382 }}
* {{ cite book | last=Helferich | first=Gerard | year=2004 | title=Humboldt's Cosmos: Alexander von Humboldt and the Latin American journey That Changed the Way We See the World | location=New York | publisher=Gotham Books | isbn=978-1-59240-052-2 }}
* {{cite thesis|last=James|first=Helen Dickson|year=1913|title=Humboldt's Ideal of Humanity|type=Master of Arts in German|publisher=University of Illinois|url=https://archive.org/details/humboldtsidealof00jame}}
* {{cite book|contributor1-last=Kutzinski|contributor1-first=Vera M.|contributor1-link=Vera Kutzinski|contributor2-last=Ette|contributor2-first=Ottmar|contributor2-link=Ottmar Ette|contribution=The Art of Science: Alexander von Humboldt's Views of the Cultures of the World (Introduction)|title=Views of the Cordilleras and Monuments of the Indigenous Peoples of the Americas, A Critical Edition|author=Alexander von Humboldt|location=Chicago|publisher=University of Chicago Press|year=2012|isbn=978-0-226-86506-5|page=xxi}}
* {{cite book|author=Alexander von Humboldt|contributor1-last=Nicolson|contributor1-first=Malcolm|contributor2-last=Wilson|contributor2-first=Jason|year=1995|contribution=Introduction|title=Personal Narrative of a Journey to the Equinoctial Regions of the New Continent|location=New York|publisher=Penguin Books|isbn=978-0-14-044553-4|url-access=registration|url=https://archive.org/details/personalnarrativ00humb}}
* {{ cite book | last=Rupke | first=Nicolaas | year=2008 | title=Alexander von Humboldt: A Metabiography | location=Chicago | publisher=University of Chicago Press | isbn=978-0-226-73149-0 }}
* {{ cite book | last=Sachs | first=Aaron | year=2006 | title=The Humboldt Current: Nineteenth-Century Exploration and the Roots of American Environmentalism | url=https://archive.org/details/humboldtcurrentn00sach | url-access=registration | location=New York | publisher=Viking | isbn=0-670-03775-3 }}
* {{cite book |last=Sachs | first=Aaron | author-link=Aaron Sachs (historian) | year=2007 | title=The Humboldt Current: A European Explorer and His American Disciples | location=Oxford and New York | publisher=Oxford University Press |isbn=978-0-19-921519-5 }}
* {{citation |title=Alexander von Humboldt chronology |editor-first=Ingo |editor-last=Schwarz |via=edition humboldt digital, ed. by Ottmar Ette. |publisher=Berlin-Brandenburg Academy of Sciences and Humanities |location=Berlin |url=http://edition-humboldt.de/X0000001 |ref={{SfnRef|Humboldt chronology}}}}
* {{ cite book | last=Walls | first=Laura Dassow | year=2009 | title=The Passage to Cosmos : Alexander von Humboldt and the Shaping of America | location=Chicago | publisher=University of Chicago Press | isbn=978-0-226-87182-0 }}
* {{ cite book | last=Wulf | first=Andrea | author-link=Andrea Wulf | year=2015 | title=[[The Invention of Nature : The Adventures of Alexander von Humboldt, the Lost Hero of Science]] | location=New York | publisher= Knopf | isbn=978-1-84854-898-5|oclc=911240481}}
* {{cite book|last=Zimmerer|first=Karl S.|chapter=Mapping Mountains|title=Mapping Latin America: A Cartographic Reader|editor1=Jordana Dym|editor2=Karl Offen|location=Chicago|publisher=University of Chicago Press|year=2011}}
{{Refend}}

==Further reading==
{{Refbegin|30em}}
* {{cite journal |last=Ackerknecht |first=Erwin H. |title=George Forster, Alexander von Humboldt, and Ethnology |journal=Isis |issue=2 |year=1955 |volume=46 |pages=83–95 |doi=10.1086/348401 |pmid=13242231 |issn=0021-1753}}
* {{cite book |last=Botting |first=Douglas |title=Humboldt and the Cosmos |location=New York |publisher=Harper & Row Publishers |year=1973}}
* {{cite book |authorlink=Jorge Canizares-Esguerra |last=Cañizares-Esguerra |first=Jorge |chapter=How Derivative was Humboldt? |title=Colonial Botany: Science, Commerce, and Politics in the Early Modern World |editor-first1=Londa |editor-last1=Schiebinger |editor-first2=Claudia |editor-last2=Swan |pages=148–165 |location=Philadelphia |publisher=University of Pennsylvania Press |year=2005}}
* {{cite journal |last=Chambers |first=David Wade |title=Centre Looks at Periphery: Alexander von Humboldt's Account of Mexican Science and Technology |journal=Journal of Iberian and Latin American Studies |issue=1 |year=1996 |volume=2 |pages=94–113 |doi=10.1080/13260219.1996.10431806 |issn=1326-0219}}
* {{cite book |editor-last1=Covarrubias |editor-first1=José E |editor-first2=Matilde |editor-last2=Souto Mantecón |title=Economia, ciencia, y política: Estudios sobre Alexander von Humboldt a 200 aňos del ensayo político sobre el reino de la Nueva España |location=Mexico |publisher=Universidad Nacional Autónoma de México |year=2012 |language=es-mx}}
* {{cite journal |last=Daum |first=Andreas W. |title=Ambiguity as Principle: Alexander von Humboldt in the Revolution of 1848 |journal=HiN – International Review for Humboldt Studies |issue=50 |year=2025b |volume=26 |pages=45–63 |doi=10.18443/378}}
* {{cite book |last=Dettlebach |first=Michael |chapter=Humboldtian Science |title=Cultures of Natural History |editor1=Nicholas Jardin |editor2=J.A. Secord |editor3=Emma C. Spary |pages=287–304 |location=Cambridge |publisher=Cambridge University Press |year=1996}}
* {{cite book |last=Echenberg |first=Myron J. |title=Humboldt's Mexico: In the Footsteps of the Illustrious German Scientific Traveller |publisher=McGill-Queen's Press - MQUP |publication-place=Montreal & Kingston |date=2017 |isbn=978-0-7735-4940-1 |oclc=964328973}}
* {{cite journal |last=Foner |first=Philip S. |title=Alexander von Humboldt on Slavery in America |journal=Science and Society |issue=3 |year=1983 |volume=47 |pages=330–342 |doi=10.1177/003682378304700305}}
* {{cite book |last=Godlewska |first=Anne |chapter=From Enlightenment Vision to Modern Science? Humboldt's Visual Thinking |title=Geography and Enlightenment |editor1=David N. Livingstone |editor2=Charles W. J. Withers |pages=236–275 |location=Chicago |publisher=University of Chicago Press |year=1999}}
* {{cite book |last=Gould |first=Stephen Jay |chapter=Church, Humboldt, and Darwin: The Tension and Harmony of Art and Science |editor=Franklin Kelly |display-editors=etal |title=Frederic Edwin Church |location=Washington D.C. |publisher=Smithsonian Institution Press |year=1989}}
* {{cite book |authorlink=Eleanor Jones Harvey |last=Harvey |first=Eleanor Jones |title=Alexander von Humboldt and the United States: Art, Nature, and Culture |publisher=Princeton University Press |publication-place=Washington, DC |date=2020-04-14 |isbn=978-0-691-20080-4}}
* {{cite journal |last=Hey'l |first=Bettina |title=Das Ganze der Natur und die Differenzierung des Wissens. Alexander von Humboldt als Schriftsteller |location=Berlin |publisher=de Gruyter |year=2007 |journal=Quellen und Forschungen zur Literatur- und Kulturgeschichte |issue=47 |page=281 |language=de}}
* {{cite book |last=Holl |first=Frank |chapter=Alexander von Humboldt's Expedition through Mexico |title=European Traveler-Artists in Nineteenth-Century Mexico |location=Mexico |publisher=Fomento Cultural Banamex |year=1996 |pages=51–61}}
* Holl, Frank, ed. ''Alejandro de Humboldt en México''. Mexico City 1997.
* Kellner, Lotte. ''Alexander von Humboldt''. New York: Oxford University Press 1963.
* {{cite book |last=Kiziak |first=Frederik L. |title=Alexander von Humboldt und Thaddäus Haenke. Reisetagebücher über Südamerika |location=Munich |publisher=GRIN Verlag |year=2021 |isbn=978-3-346-69180-4 |language=de}}
* [[Ursula Klein|Klein, Ursula]]. ''Humboldts Preußen. Wissenschaft und Technik im Aufbruch''. Darmstadt: Wissenschaftliche Buchgesellschaft 2015.
* {{cite book |last=Korneffel |first=Peter |title=Die Humboldts in Berlin: Zwei Brüder erfinden die Gelehrtenrepublik |publisher=Elsengold Verlag GmbH |year=2017 |isbn=978-3-944594-77-4}}
* [[Vera Kutzinski|Kutzinski, Vera M.]] ''Alexander von Humboldt's Transatlantic Personae''. New York: Routledge 2012.
* Lara Valdés, José Luis, ed. ''Bicentenario de Humboldt en Guanajuato (1803–2003)''. Guanajuato: Ediciones de la Rana 2003.
* {{cite book |last1=Leibsohn |first1=Dana |first2=Barbara E. |last2=Mundy |chapter=Making Sense of the Pre-Columbian |title=Vistas: Visual Culture in Spanish America, 1520–1820 |year=2015 |chapter-url=https://vistas.ace.fordham.edu/themes/pre-columbian-images-08/ |url=http://www.fordham.edu/vistas}}
* {{cite book |authorlink=William Macgillivray |last=Macgillivray |first=William |url=https://www.biodiversitylibrary.org/item/77447 |title=The travels and researches of Alexander von Humboldt by W. Macgillivray; with a narrative of Humboldt's most recent researches |location=New York |publisher=J & J Harper |year=1833 |doi=10.5962/bhl.title.33029}}
* {{cite book |last=Novgorodoff |first=Danica |title=Alexander Von Humboldt: Explorer, Naturalist & Environmental Pioneer |location=New York |publisher=Crown |year=2022}}
* {{cite book |first=W. |last=Macgillivray |url=https://www.biodiversitylibrary.org/item/63302 |title=The travels and researches of Alexander von Humboldt: being a condensed narrative of his journeys in the equinoctial regions of America, and in Asiatic Russia: together with analysis of his more important investigations |publisher=J. & J. Harper |publication-place=New York, N.Y |year=1833 |doi=10.5962/bhl.title.22635}}
* McCrory, Donald. ''Nature's Interpreter: The Life and Times of Alexander von Humboldt''. London: Lutterworth 2010.
* [[David McCullough|McCullough, David]]. ''[[Brave Companions: Portraits in History]]'', Chapter 1, "[Humboldt's] Journey to the Top of the World" New York: Simon & Schuster, 1992.
* {{cite book |last=Meinhardt |first=Maren |title=A longing for wide and unknown things : the life of Alexander von Humboldt |location=London |publisher=Hurst & Company |year=2018 |isbn=978-1-84904-890-3}}
* {{cite book |last=Miranda |first=José |title=Humboldt y México |location=Mexico City |publisher=Instituto de Historia, Universidad Nacional Autónoma de México |year=1962}}
* Nelken, Halina. ''Alexander von Humboldt. His Portraits and their Artists. A Documentary Iconography''. Berlin: Dietrich Reimer Verlag 1980.
* Ortega y Medina, Juan A. ''Humboldt desde México''. Mexico City: UNAM 1960.
* Ortega y Medina, Juan A. "Humboldt visto por los mexicanos" in Jorge A. Vivó Escoto, ed. ''Ensayos sobre Humboldt'', pp.&nbsp;237–258. Mexico City: UNAM 1962.
* {{cite journal |last1=Pausas |first1=Juli G. |last2=Bond |first2=William J. |title=Humboldt and the reinvention of nature |journal=Journal of Ecology |volume=107 |issue=3 |date=2019 |issn=0022-0477 |doi=10.1111/1365-2745.13109 |pages=1031–1037 |bibcode=2019JEcol.107.1031P |hdl=10261/182537 |hdl-access=free}}
* {{cite journal |authorlink=Eloise Quiñones Keber |last=Quiñones Keber |first=Eloise |title=Humboldt and Aztec Art |journal=Colonial Latin American Review |volume=5 |issue=2 |year=1996 |pages=277–297 |doi=10.1080/10609169608569894}}
* {{cite journal |authorlink=Nathaniel Rich (novelist) |last=Rich |first=Nathaniel |title=The Very Great Alexander von Humboldt" (review of {{harvnb|Wulf|2015}} and [[Jedediah Purdy]], ''After Nature: A Politics for the Anthropocene'', Harvard University Press, 2015, 326 pp.) |journal=[[The New York Review of Books]] |volume=LXII |issue=16 |date=22 October 2015 |pages=37–39}}
* {{cite web |last=Rooks |first=Timothy |title=How Alexander von Humboldt put South America on the map |date=12 July 2019 |access-date=6 April 2021 |publisher=[[Deutsche Welle]] |url=https://www.dw.com/en/how-scientist-alexander-von-humboldt-put-spanish-south-america-on-the-global-map/a-46693502 |ref=none}}
*{{cite book |editor-last1=Zea |editor-first1=Leopoldo |editor-first2=Carlos |editor-last2=Magallón |title=Humboldt en México |location=Mexico City |publisher=Universidad Nacional Autónoma de México |year=1999}}
{{Refend}}

===Literary works===
{{Refbegin|30em}}
* [[Daniel Kehlmann]]'s 2005 novel ''Die Vermessung der Welt'', translated into English by Carol Brown Janeway as ''[[Measuring the World]]'' in 2006, explores Humboldt's life through the lens of historical fiction, contrasting his character and contributions to science with those of [[Carl Friedrich Gauss]].
{{Refend}}

===Portrayals in film===
{{Refbegin|30em}}
*[[Werner Herzog]] portrays Humboldt in [[Edgar Reitz]]'s 2013 film ''[[Home from Home (2013 film)|Home from Home]]''.
*[[Measuring the World (film)|Measuring the World]] is a 2012 German / Austrian 3D film directed by [[Detlev Buck]] and was released in 2012 based on the [[Measuring the World|eponymous novel]] by [[Daniel Kehlmann]].
*Climbing the Chimborazo (Ascenso al volcán Chimborazo) (1989), a film directed by [[Rainer Simon]].
{{Refend}}

==External links==
{{Commons category}}
{{Wikiquote}}
{{wikisource|Author:Alexander von Humboldt|Alexander von Humboldt}}
{{Library resources box}}

===Portals===
* {{cite web |url=http://www.avh.de/en/index.htm |title=The Alexander von Humboldt Foundation |archive-url=https://web.archive.org/web/20031202025506/http://www.avh.de/en/index.htm |archive-date=2003-12-02 }}
* {{cite web |url=http://www.avhumboldt.net |title=The Alexander von Humboldt Digital Library |archive-url=https://web.archive.org/web/20201125020807/http://www.avhumboldt.net/ |archive-date=2020-11-25 }} A virtual research environment on the works of Alexander von Humboldt. A project by the University of Applied Sciences Offenburg and the University of Kansas.
* {{cite web|url=http://www.avhumboldt.de |website=avhumboldt.de |title=Humboldt Informationen online}} A large collection of data, texts and visuals concerning Alexander von Humboldt in German, English, Spanish and French. A project by the Chair of Romance Literatures, University of Potsdam (Germany).
* {{cite web |url=http://socgeo.ruhosting.nl/content/currentprogramme.html|archive-url=https://archive.today/20130112152559/http://socgeo.ruhosting.nl/content/currentprogramme.html |archive-date=2013-01-12|title=Web site of the Humboldt Lecture series in Nijmegen, the Netherlands}}
* {{cite web |url=http://www.larramendi.es/vcilustrados/i18n/consulta_aut/registro.do?id=3034 |title=Alexander von Humboldt |website=Polymath Virtual Library, Fundación Ignacio Larramendi |language=es}}
* {{cite web |url=https://bibnum.obspm.fr/exhibits/show/humboldt |title=Virtual exhibition on Paris Observatory digital library |language=fr}}

===Online sources===
* {{BHL author}}
* {{Gutenberg author|id=1995}}
* {{Librivox author|id=359}}
* {{Internet Archive author}}

===Miscellaneous===
* {{cite episode |url=http://www.bbc.co.uk/radio4/history/inourtime/inourtime_20060928.shtml |title=Alexander von Humboldt |series-link=In Our Time (radio series)|series=In Our Time |network=[[BBC Radio 4]] |date=28 Sep 2006}}
* {{cite web |url=http://www-personal.umich.edu/~jbourj/money5.htm |title=Alexander von Humboldt featured on the East German 5 Marks banknote from 1964 |website=Banknotes featuring Scientists and Mathematicians}}
* [https://americanart.si.edu/exhibitions/humboldt Alexander von Humboldt and the United States: Art, Nature, and Culture] 2020-2021 exhibition at the [[Smithsonian American Art Museum]]
* {{cite journal | last=Raat | first=A.J.P. | title=Alexander von Humboldt and Coenraad Jacob Temminck | journal=Zoologische Bijdragen | volume=21 | issue=1 | date=1976 | issn=0459-1801 | pages=19–38 | url=https://repository.naturalis.nl/pub/317208}}
* {{Cite PSM|last=Bois-Reymond|first=Emil du|author-link=Emil du Bois-Reymond|pages=145–160|month-and-year=December 1883|volume=24 |wstitle=Alexander von Humboldt|ref=none}}
* {{Cite Appletons'|wstitle=Humboldt, Friedrich Heinrich Alexander von|year=1900|notaref=x |short=x}}
* {{cite journal |first=L. |last=Kellner |url=http://amshistorica.unibo.it/diglib.php?inv=7&int_ptnum=95&term_ptnum=260&format=jpg |title=Alexander Von Humboldt and the history of international scientific collaboration |journal=Scientia |issue=95 |year=1960 |pages=252–256 |issn=0036-8687}}

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{{Copley Medallists 1851–1900}}
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{{DEFAULTSORT:Humboldt, Alexander von}}
[[Category:Alexander von Humboldt| ]]
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