10de, door den schrijver herz. en veel vermeerderde dr. 1895

Jacobus Schoondermark (1849-1915) was the author of popular books on sexuality. Although he did not complete his medical education, he called himself Dr. and Professor. (See Gert Hekma on Schoondermark ("a quack"), in: Who's Who in Gay and Lesbian History: from Antiquity to World War II, ed. Robert Aldrich and Gary Wotherspoon, New York, 2002, p. 466)