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 German, signed “A. Humboldt,” one page both sides, 3.75 x 4.75, no date. A fascinating scientific letter to the geologist Brochant de Villiers, speaking about several types of minerals. In very good to fine condition, with scattered light foxing, and a stain to the upper right corner.
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