Dr. J. Marion Sims, _On the Microscope as an Aid in the Diagnosis and Treatment of Sterility_, _New York Medical Journal_, January 1869, p. 406; Charles Darwin, _The Variation of Animals and Plants under Domestication_, vol. ii. p. 198; _Philadelphia Medical and Surgical Reporter_, November 2, 1867, p. 384; A. Debay, _Hygiène et Physiologie du Mariage_, p. 288 (Paris, Quarante-quatrième édition); Raciborski, _De la Puberté_, etc., p. 451; Virey, _De la Femme sous ses Rapports Phys._, etc., p. 332; Dr. Gunning S. Bedford, _The Principles and Practice of Obstetrics_, p. 107. P. 115. THE LIMITATION OF OFFSPRING.--We have taken great pains to avoid giving false or dangerous impressions in this section. The references in the order of quotation are:--Dr. Tilt, _Hand-Book of Uterine Therapeutics_, p. 317; Dr. Duncan, _Fecundity, Fertility, Sterility, and Allied Topics_, pp. 289, 290; Dr. Hillier, _Diseases of Children_, p. 114; John Stuart Mill, _Principles of Political Economy_, p. 591; Dr. Drysdale, _London Medical Press and Circular_, December, 1868, p. 478; Raciborski, _De l'Age Critique chez la Femme_, p. 484; _The Nation_, June 1869; Dr. Edward Reich, _Natur und Gesundheitslehre des Ehelichen Lebens_, p. 493; _Boston Medical and Surgical Journal_, February 1867; _Philadelphia Medical and Surgical Reporter_, vol. xix. p. 305; Sismondi, _Principles of Political Economy_, book vii. chap. v.; Dr. MacCormac, in _London Medical Press and Circular_, March 1869, p. 244; Dr. Gaillard Thomas, _Diseases of Women_, p. 58; _Leavenworth Medical Herald_, April, 1867; Dr. N. K. Bowling, in _The Nashville Journal of Medicine and Surgery_, October 1868. We have rather let others speak than spoken ourselves, and have collected the opinions of many most distinguished physicians and statesmen, who thus pronounce against excessive child-bearing. Any intelligent physician will acknowledge the weight to be assigned to such names. P. 128. SIGNS OF FRUITFUL CONJUNCTION.--Carpenter, _Human Physiology_, p. 772; Dr. Gunning S. Bedford, _Principles and Practice of Obstetrics_, p. 304; Menville, vol. i p. 295; Montgomery, _Signs and Symptoms of Pregnancy_, p. 90.