First Edition. 159 pp., 8 pages of Williams & Norgate ads at rear, dated 'February 1863.' Waterhouse-Hawkins frontispiece present. Classic in the field of Evolution it is also Huxley's ("Darwin's Bulldog") most-famous work. Published 8 years before Darwin's 1871 'Descent of Man.' Encased within Red Half-Leather Clamshell.