German geographer, naturalist and explorer (1769-1859), who made very significant contributions to several fields of science including botany, zoology and geophysics. After 5 years (from 1799 through 1804) of travelling through Latin America, Humboldt published a series of large volumes with valuable information, later was the first to propose that humans were changing the world climate.
Autograph letter signed, to British writer Helen Maria Williams (1759-1827), in French, sold with a transcription and translation. One page, mail stamp on verso indicates the year 1812, addressed to Williams. Humboldt praises her poetry. Size is 7 x 9.25 inches, folds, in very good condition.
ALSO INCLUDED is a photo of a portrait of Humboldt, the famous 1843 painting by Joseph Stieler, stamped by photographer.