German naturalist and explorer (1769-1859) who wrote Kosmos, a massive five-volume study which attempted to unify the various branches of man's knowledge. ALS in French, signed “Humboldt,” three pages on two adjoining sheets, 5 x 8, no date but circa 1833. Letter to LouisFreycinet, a French navigator who in 1811 published the first full outline of the coast of Australia. An untranslated scientific letter referring to Georg Erman's 1833 publication on his travels in Asia. Humboldt writes that he is interested in his works on longitudes, latitudes, and the meridian of the Azores. He compares the numbers that Erman found with the numbers he had in his own book, and asks Freycinet to compare barometric observations made in his own travels with Erman’s discoveries. At the end, he asks Freycinet, his colleague at the Geographical Society, if he possesses a barometer of a certain type. On the first page in Freycinet’s hand is a one-word note, “Barometre.” In fine condition, with several staple-like holes to the upper blank area.
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