Geneve, Paris, Bruxelles: L Held, L. Hachette et Cie, A. Lacroix van Mennen et Cie 1860. Authorized French edition. XVI, 285 pages. 8vo (5 1/2 x 8 3/4 inches) Frontispiece is steel engraving of Humboldt. 1/4 leather over marbled boards w/gilt spine titles. Light overall wear to the binding. Uniformly tanned paper throughout. Speckled page edges. Originally issued in printed wrappers, here in a nice binding that can be read and handled. Occasional penciled line in the margins. Text in French. Near Fine. Boards. 
Friedrich Wilhelm Heinrich Alexander von Humboldt (14 September 1769 – 6 May 1859) was a Prussian polymath, geographer, naturalist, explorer, and proponent of Romantic philosophy and science. Karl August Varnhagen von Ense (21 February 1785 in Düsseldorf – 10 October 1858 in Berlin) was a German biographer, diplomat and soldier who carried on an extensive correspondence with von Humboldt (wiki).