[4] Goltz, Centralblatt fuer die med.  Wissenschaften, 1865, No. 19, and 1866, No. 18; also Beitraege zur Lehre von den Funktionen des Frosches, Berlin, 1869, p. 20.

[5] J. Tarchanoff, “Zur Physiologie des Geschlechtsapparatus des Frosches,” Archiv fuer die Gesammte Physiologie, 1887, vol. xl, p. 330.

[6] E. Steinach, “Untersuchungen zur vergleichenden Physiologie der maennlicher Geschlechtsorgane insbesondere der accessorischen Geschlechtsdruesen,” Archiv fuer die Gesammte Physiologie, vol. lvi, 1894, pp. 304-338.

[7] See, e.g., Shattock and Seligmann, “The Acquirement of Secondary Sexual Characters,” Proceedings of the Royal Society, vol. lxxiii, 1904, p. 49.

[8] For facts bearing on this point, see Guinard, art.  “Castration,” Richet’s Dictionnaire de Physiologie.  The general results of castration are summarized by Robert Mueller in ch. vii of his Sexualbiologie; also by F.H.A.  Marshall, The Physiology of Reproduction, ch, ix; see also E. Pittard, “Les Skoptzy,” L’Anthropologie, 1903, p. 463.

[9] For an ancient discussion of this point, see Schurig, Spermatologia, 1720, cap. ix.

[10] J.J.  Matignon, Superstition, Crime, et Misere en Chine, “Les Eunuques du Palais Imperial de Pekin,” 1901.

[11] P. Marie, “Eunuchisme et Erotisme,” Nouvelle Iconographie de la Salpetriere, 1906, No. 5, and Progres medical, Jan. 26, 1907.

[12] Pedagogical Seminary, July, 1897, p. 121.

[13] See, for instance, the case reported in another volume of these Studies ("Sexual Inversion"), in which castration was performed on a sexual invert without effecting any change.

[14] Guinard, art.  “Castration,” Dictionnaire de Physiologie.

[15] M.A.  Colman, Medical Standard, August, 1895; Clara Barrus, American Journal of Insanity, April, 1895; Macnaughton-Jones, British Gynaecological Journal, August, 1902; W.G.  Bridgman, Medical Standard, 1896; J.M.  Cotterill, British Medical Journal, April 7, 1900 (also private communication); Paul F. Munde, American Journal of Obstetrics, March, 1899.

[16] See Swale Vincent, Internal Secretion and the Ductless Glands, 1912; F.H.A.  Marshall, The Physiology of Reproduction, 1910, ch. ix; Munzer, Berliner klinische Wochenschrift, Nov., 1910; C. Sajous, The Internal Secretions, vol. i, 1911.  The adrenal glands have been fully and interestingly studied by Glynn, Quarterly Journal of Medicine, Jan., 1912; the thyroid, by Ewan Waller, Practitioner, Aug., 1912; the internal secretion of the ovary, by A. Louise McIlroy, Proceedings Royal Society Medicine, July, 1912.  For a discussion at the Neurology Section of the British Medical Association Meeting, 1912, see British Medical Journal, Nov. 16, 1912.