HUMBOLDT, ALEXANDER VON. Autograph Letter Signed, "Humboldt," to Monsieur Tomard?, of the Bibliotheque Royale, in French, about the mapping of the interior of Africa and inquiring about a Catalan atlas of the 15th century and the voyage of Ferrer in

HUMBOLDT, ALEXANDER VON. Autograph Letter Signed, "Humboldt," to Monsieur Tomard?, of the Bibliotheque Royale, in French, about the mapping of the interior of Africa and inquiring about a Catalan atlas of the 15th century and the voyage of Ferrer in 1346. 1 page, folded 8vo sheet with integral address leaf; hinged to a larger sheet. Np, ndE300/400 Humboldt (1769-1859) German naturalist and scientist, traveled through South America, devised isothermal lines to compare climactic conditions, his 5-volume Kosmos is considered a science landmark.