Footnote 90: _Loc. cit._ p. 250. Footnote 91: _Loc. cit._ p. 253. Footnote 92: _Loc. cit._ p. 163. Footnote 93: _Loc. cit._ p. 208. Footnote 94: Ploss-Bartels in “Das Weib,” Seventh Edition, 1902. Vol. II., pp. 228–229 is the source of information on this matter. Footnote 95: Ploss-Bartels, _loc. cit._ vol. I., p. 489. Footnote 96: Pozzi, “Traité de Gynécologie,” p. 1067, 1890. Footnote 97: “Real-encyclopädie d. Gesammten Heilkunde,” Second Edition, vol. X., p. 34, 1885. Footnote 98: It would be interesting to find out whether or no Hindoo or Chinese virgins suffer from _chloranæmia_; at present we have no information on this matter. Footnote 99: Ploss-Bartels, _loc. cit._ p. 622. Footnote 100: Saint Cyr, “Traité d’obstétrique vétérinaire,” p. 52, Second Edition, 1888. Footnote 101: _Philosophical Transactions of the Royal Society of London, 1897_, pp. 135–166. Footnote 102: “Verhandlungen der Berliner Gesellschaft für Anthropologie,” p. 88, 1876. Footnote 103: Ploss-Bartels, _loc. cit._ p. 625. Footnote 104: Vratch, in Russian, p. 1456, 1901. Footnote 105: Ploss-Bartels, _loc. cit._ p. 443. Footnote 106: Rakhmanoff. Footnote 107: Ploss-Bartels, _loc. cit._ p. 626. Footnote 108: _Ibid._ p. 626. Footnote 109: “Venus Urania,” Leipzig, 1798. Footnote 110: Moll, “Untersuch. über die Libido Sexualis,” vol. I., p. 44. Footnote 111: “Real-encyclopædie der gesammt. Heilkunde,” vol. XIV., p. 593. Second Edition, 1888. Footnote 112: Fürbringer, _loc. cit._ Footnote 113: “Dictionnaire encyclopédique des Sciences médicales,” vol. XV., p. 378, 1881. Footnote 114: Fritsch, “Die Eingeborenen Süd-Afrikas.” Breslau, 1873. Footnote 115: Information that I have obtained from the Zoological Gardens at Anvers would seem to show the existence of similar differences between the sexes in the case of monkeys. Footnote 116: Wappaeus, “Allgemeine Bevölkerungsstatistik,” vol. II., p. 285, 1861. Footnote 117: “Sur les Altérations pathologo-anatomiques des Testicules pendant la Vieillesse,” St. Petérsbourg, 1894 (in Russian). A few years ago, in course of the examination of the body of a man who had died at the age of 103 at Lyons, the seminal vesicles were found to be full of ripe and active spermatozoa. “Annales d’Hygiène publique,” p. 370, 1900. Footnote 118: _Loc. cit._ p. 377. Footnote 119: “Die Welt als Wille und Vorstellung,” vol. II., Supplement to chap. xliv. Footnote 120: _Loc. cit._ p. 364. Footnote 121: _See_ chap. i. Footnote 122: Vol. I. chap. xxxv. Footnote 123: “L’Anthropologie,” vol. IV., p. 129, 1893. Footnote 124: Waitz-Gerland, “Anthropologie der Naturvölker,” vol. VI., p. 139, 1872. Footnote 125: “Völkerkunde,” vol. I. p. 274, 1885. Footnote 126: Huxley, “Man’s Place in Nature,” p. 60. Footnote 127: Sutherland, “Origin and Development of the Moral Instinct.”