[XVIII-33] _Morals in Evolution_, pp. 130, 71. [XVIII-34] William Wundt, _Elements of Folk Psychology_, trans. by Schaub, Macmillan, 1916, p. 1. [XVIII-35] Ibid., p. 478. [XVIII-36] Ibid., p. 514. [XVIII-37] Ibid., p. 515. [XVIII-38] Ibid., p. 516. [XVIII-39] Franz Boas, _The Mind of Primitive Man_, Macmillan, 1911, p. 102. [XVIII-40] Hobhouse, _Social Evolution and Political Theory_, p. 39. [XVIII-41] W. I. Thomas, _Source Book for Social Origins_, University of Chicago Press, 1909, p. 18. [XVIII-42] Ibid., p. 20. [XVIII-43] Ibid., p. 14. [XVIII-44] Thomas, _Sex and Society_, p. 51. [XVIII-45] Thomas and Znaniecki, _The Polish Peasant in Europe and America_, University of Chicago Press, 1918, I:22. CHAPTER XIX [XIX-1] Francis Galton, _Hereditary Genius_, Macmillan, 1914. [XIX-2] _Inquiries into the Human Faculty_, Dutton, 1908. [XIX-3] See C. W. Saleeby, _The Progress of Eugenics_, Funk and Wagnalls, 1914, pp. 1 ff. [XIX-4] Karl Pearson, _The Grammar of Science_, Black, 1911, p. 1. [XIX-5] Ibid., p. 6. [XIX-6] See Saleeby, _The Progress of Eugenics_, Ch. II. [XIX-7] See C. B. Davenport, _Heredity in Relation to Eugenics_, Holt, 1911. [XIX-8] See Popenoe and Johnson, _Applied Eugenics_, Macmillan, 1918. [XIX-9] Ibid., p. 213. [XIX-10] Ibid., pp. 218, 231. [XIX-11] Ibid., Ch. XVI. [XIX-12] Ibid., p. 381. [XIX-13] Ibid., p. 380. [XIX-14] Saleeby, _The Progress of Eugenics_, p. 65. [XIX-15] Popenoe and Johnson, op. cit., p. 387. [XIX-16] Hobhouse, _Social Evolution and Political Theory_, Lemcke, 1911, p. 45. [XIX-17] Popenoe and Johnson, op. cit., p. 292. CHAPTER XX [XX-1] Ludwig Gumplowicz, _Der Rassenkampf_, Innsbruck, 1883, p. 64. [XX-2] Gumplowicz, _Grundriss der Sociologie_, tr. by Moore, 1885, p. 134. [XX-3] Gumplowicz, _Sociologie und Politik_, p. 94. [XX-4] Friedrich Nietzsche, _Genealogy of Morals_, New York, 1897, p. 46. [XX-5] Nietzsche, _The Will to Power_, 1889, pp. 90, 269, 660 ff. [XX-6] S. N. Patten, _A Theory of Social Forces_, 1896, Ch. IV. [XX-7] T. N. Carver, _Essays in Social Justice_, Harvard University Press, 1915, pp. 30, 34. [XX-8] Ibid., p. 46. [XX-9] Ibid., pp. 49, 50. [XX-10] Ibid., p. 56. [XX-11] Ibid., p. 77. [XX-12] Op. cit. [XX-13] T. N. Carver, _Principles of Political Economy_, Ginn, 1919, pp. 37 ff. Also see _Essays in Social Justice_, p. 86. [XX-14] _Essays in Social Justice_, p. 86. [XX-15] Ibid., p. 108. [XX-16] _Principles of Political Economy_, p. 43. [XX-17] J. Novicow, _War and its Alleged Benefits_, trans. by Seltzer, Holt, 1911. [XX-18] E. A. Ross, _Principles of Sociology_, Century, 1920, p. 167. [XX-19] Ibid., p. 183. [XX-20] Ibid., pp. 207, 206. CHAPTER XXI [XXI-1] Cf. S. H. Swinny, “Giambatista Vico,” _Sociological Review_, Jan. 1914, pp. 50–57. [XXI-2] Peter Kropotkin, _Mutual Aid; a Factor in Evolution_, Doubleday, Page, 1902, p. 3. [XXI-3] Ibid., p. VII; cf. Kropotkin, _Fields, Factories and Workshops_, Putnam, 1901, Ch. 1.