[88] A. Wiltshire, British Medical Journal, March, 1883.  The best account of heat known to me is contained in Ellenberger’s Vergleichende Physiologie der Haussauegethiere, 1892, Band 4, Theil 2, pp. 276-284.

[89] Schurig (Parthenologia, 1729, p. 125), gives numerous references and quotations.

[90] Quoted by Icard, La Femme, etc., p. 63.

[91] Bland Sutton, Surgical Diseases of the Ovaries, and British Gynecological Journal, vol. ii.

[92] W. Heape, “The Menstruation of Semnopithecus Entellus,” Philosophical Transactions, 1894; “Menstruation and Ovulation of Macacus Rhesus,” Philosophical Transactions, 1897.

[93] W.L.  Distant, “Notes on the Chacma Baboon,” Zooelogist, January, 1897, p, 29.

[94] Nature, March 23, 1899.

[95] W. Heape, “The Menstruation of Semnopithecus Entellus,” Philosophical Transactions, 1894, p. 483; Bland Sutton, Surgical Diseases of the Ovaries, 1896.

[96] T. Bryce and J. Teacher (Contributions to the Study of the Early Development of the Human Ovum, 1908), putting the matter somewhat differently, regard menstruation as a cyclical process, providing for the maintenance of the endometrium in a suitable condition of immaturity for the production of the decidua of pregnancy, which they believe may take place at any time of the month, though most favorably shortly before or after a menstrual period which has been accompanied by ovulation.

[97] Robinson, American Gynecological and Obstetrical Journal, August, 1905.

[98] Bossi, Annali di Ostetrica e Ginecologia, September, 1896; summarized in the British Medical Journal, October 31, 1896.  As regards the more normal influence of the ovaries over the uterus, see e.g.  Carmichael and F.H.A.  Marshall, “Correlation of the Ovarian and Uterine Functions,” Proceedings Royal Society, vol. 79, Series B, 1907.

[99] Beuttner, Centralblatt fuer Gynaekologie, No. 49, 1893; summarized in British Medical Journal, December, 1893.  Many cases show that pregnancy may occur in the absence of menstruation.  See, e.g., Nouvelles Archives d’Obstetrique et de Gynecologie, 25 Janvier, 1894, supplement, p. 9.

[100] It is still possible, and even probable, that the primordial cause of both phenomena is the same.  Heape (Transactions Obstetrical Society of London, 1898, vol. xl, p. 161) argues that both menstruation and ovulation are closely connected with and influenced by congestion, and that in the primitive condition they are largely due to the same cause.  This primary cause he is inclined to regard as a ferment, due to a change in the constitution of the blood brought about by climatic influences and food, which he proposes to call gonadin. (W.  Heape, Proceedings of Royal Society, 1905, vol.  B. 76, p. 266.)