LETTERS of Alexander von Humboldt to Varnhagen von Ense. From 1827 to 1858. With Extracts from Varnhagen's Diaries, and Letters of Varnhagen and others to Humboldt. Translated from Second German Edition, By Friedrich Kapp. New York: Rudd & Carleton, 130 Grand Street, Leipzig: F. A. Brockhaus. M DCCC LX. Rudd & Carleton, Brockhaus | Hersteller New York, Leipzig, 1860 Humboldt Sammlung