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,” one page both sides, 7.25 x 9, April 6, 1819. Untranslated handwritten letter by Humboldt, referring to "sciences naturelles." The integral leaf has been professionally inlaid into a slightly larger sheet. In fine condition.
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