(4) ——. Darwinism. An exposition of the theory of natural selection with some of its applications. Chap. iv, "The Struggle for Existence," pp. 14-40; chap. v, "Natural Selection by Variation and Survival of the Fittest," pp. 102-25. 3d ed. London, 1901.
(5) Weismann, August. On Germinal Selection as a Source of Definite Variation. Translated from the German. Chicago, 1896.
(6) Malthus, T. R. An Essay on the Principle of Population. Or a view of its past and present effects on human happiness, with an inquiry into our prospects respecting the future removal or mitigation of the evils which it occasions. 2d ed. London, 1803. [1st ed., 1798.]
(7) Knapp, G. F. "Darwin und Socialwissenschaften," Jahrbücher für Nationalökonomie und Statistik. Erste Folge, XVIII (1872), 233-47.
(8) Thomson, J. Arthur. Darwinism and Human Life. New York, 1918.
II. ECONOMIC COMPETITION
(1) Wagner, Adolf. Grundlegung der politischen Ökonomie. Pp. 794-828. [The modern private industrial system of free competition.] Pp. 71-137. [The industrial nature of men.] Leipzig, 1892-94.
(2) Effertz, Otto. Arbeit und Boden. System der politischen Ökonomie. Vol. II, chaps, xix, xx, xxi, xxiii, xxiv, pp. 237-320. Berlin, 1897.
(3) Marshall, Alfred. Principles of Economics. Appendix A, "The Growth of Free Industry and Enterprise," pp. 723-54. London, 1910.
(4) Seligman, E. R. A. Principles of Economics. Chap, x, pp. 139-53. New York, 1905.