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 “Alexander Bn. de Humboldt, Chambellan du Roi,” one page, 7.25 x 9, September 15, 1806. Untranslated handwritten letter from Berlin. The red wax seal affixed at the bottom is cracked but intact. In very good condition, with intersecting folds, moderate overall creasing, and a partial split through his last name.
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