CHAPTER XIII

THE LAW OF SIMILARITY

Instinctive aversion among animals to pairing with individuals belonging to another species, pp. 278-280.—Infertility of first crosses and of hybrids, pp. 279, _et seq._—‘The Law of Similarity,’ p. 280.—Bestiality, pp. 280, _et seq._—The various human races said to have an instinctive aversion to intermingling, pp. 281, _et seq._—Intermixture of races, pp. 282, _et seq._—Its effects on fertility, pp. 283-288.—Rejection of M. Broca’s theory as to the infertility of the connections of Europeans with Australian women, pp. 284-287.—The doctrine of the unity of mankind independent of the degree of fertility of first crosses, and of mongrels, pp. 288, _et seq._