The composite character of the semen was recognized by various old authors, some of whom said, (e.g., Wharton) that it had three constituents, which they usually considered to be: (1) The noblest and most essential part, from the testicles; (2) a watery element from the vesiculæ; (3) an oily element from the prostate. Schurig, Spermatologia, 1720, p. 17.
See, e.g., C. Mansell Moulin, "A Contribution to the Morphology of the Prostate," Journal of Anatomy and Physiology, January, 1895; G. Walker, "A Contribution to the Anatomy and Physiology of the Prostate Gland, and a Few Observations on Ejaculation," Johns Hopkins Hospital Bulletin, October, 1900.
For a study of the semen and its constituents, see Florence, "Du Sperme," Archives d'Anthropologie Criminelle, 1895.
J. Hunter, Essays and Observations, vol. i, p. 189.