(Leipzig, Johann Ambrosius Barth, 1809). Without wrappers as issued in "Annalen der Physik und der Physikalischen Chemie. Hrsg. Ludwig Wilhelm Gilbert", Bd. 31, Viertes Stück. Pp. 337-452 a. 1 engraved plate. (The entire issue offered). Humboldt's paper: pp. 337-397.
First edition of Humboldt's large paper on the refraction in the atmosphere and his caloric theory of absorption. - Darmstaedter 1809 H.
Order-nr.: 44060