DARWIN, Ch. The origin of species. 6th ed. (33th thousand). Lond., J. Murray, 1888. xxi, (1), 458, 32 pp. -- Id. The descent of man, and selection in relation to sex. 2nd ed. (13th thousand), rev. & augm. Lond., J. Murray, 1879. xvi, 693 pp. -- 2 vols. Or. green cl. w. gilt lettering. (Spine ends sl. chipped, weak/rep. hinges).