ECONOMY - Malthus, T[homas] R[obert]. An essay on the principle of population; or, a view of its past and present effects on human happinesss. The third edition. 2 vols. London, J. Johnson, 1806. 8°. XVI, 505 p., [30] ll. (index); VII, 559 pp. D. leather with spine labels and linear spine gilt (somewhat rubbed and scuffed). Kress B.5067 - Goldsmiths 19210 - Einaudi 3669. - Third version, revised and expanded in the second volume to include an appendix (pp. 505-559), in which Malthus responds to criticisms of his population theory. "The 'Essay' was highly influential in the progress of thought in early 19th century Europe. This simple generalization on population increase, and the social policy Malthus advocated were widely discussed" (PMM 251). - Especially the reception by Darwin and the theory of evolution had consequences. - Lightly foxed in places, mostly in the margins.