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Haller, Elementa Physiologiæ, 1778, vol. vii, p. 57. Hammond, Sexual Impotence, p. 129. Fürbringer, Senator and Kaminer, Health and Disease in Relation to Marriage, vol. i, p. 221. Forel, Die Sexuelle Frage, p. 80. Guyot, Bréviaire de l'Amour Expérimental, p. 144. Erb, Ziemssen's Handbuch, Bd. xi, ii, p. 148. Guttceit also considered that the very wide variations found are congenital and natural.
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