8vo. xvi, 300, 32pp. With a terminal publisher's advertisement catalogue. Original publisher's green cloth, stamped in gilt and blind. Recased, with new endpapers. Housed in modern green morocco-backed clamshell case. Extremities rubbed and a trifle marked. Scattered spotting.

The second edition, revised and significantly enlarged from the first of 1862, of Darwin's first detailed demonstration of his theory of evolution through natural selection, analysing how complex ecological relationships resulted in the coevolution of orchids and insects.