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, 4 x 5, no date. Brief letter to a gentleman. Integral second page bears a mailing address in Humboldt’s hand and red wax seal. In fine condition, a few creases and wrinkles and small area of paper loss to bottom corner of second page. R&R COA.
