[755] Mensinga, “Incapacity for Lactation, and its Cure” (Berlin and Neuwied, 1888).
[756] G. von Bunge, “The Increasing Incapacity of Women to Suckle their Children” (Munich, 1903).
[757] G. Hirth, “The Maternal Breast: its Indispensability and its Education for the Restoration of its Primitive Forces,” published in “Ways to Love,” pp. 1-57.
[758] Emil Abderhalden, “The Question of the Incapacity of Mothers to Suckle their Children,” published in Medizinische Klinik, 1906, No. 45.
[759] A. Hegar, “Atrophy of the Mammary Glands and the Incapacity for Lactation,” published in the Archives for Racial and Social Hygiene, 1905, vol. ii., pp. 830-844.
[760] Cf. F. Kraus, “Blood-Relationship in Marriage and its Consequences to the Offspring,” published in Senator-Kaminer, “Health and Disease in Relation to Marriage and the Married State,” p. 79 (London, Rebman Limited, 1906).
[761] Charles Darwin, “The Descent of Man,” vol. ii., pp. 354, 355 (London, 1898).
[762] W. Schallmayer, “The Sociological Importance of the Offspring of Talented Persons, and Psychical Inheritance,” published in the Archives of Racial and Social Biology, 1905, vol. ii., pp. 36-75. Cf. also S. R. Steinmetz, “The Offspring of Talented Persons,” published in the Zeitschrift für Sozialwissenschaft, 1904, No. 1.
[763] Carl Vogt, “The Ocean and the Mediterranean: Letters of Travel,” vol. ii., pp. 203, 204 (Frankfurt-on-the-Main, 1848).
[764] Alexander von Humboldt (“Journey in Tropical Regions,” vol. ii., p. 17) remarks that in Europe a greatly deformed or hideous girl, if only she possesses property, can marry, and that the children frequently inherit the malformations of the mother; whereas among savage races there exists a natural disinclination to such marriages—a disinclination which money is not able to overcome.