[470] Näcke’s thesis is in agreement with this, that “all sexual abnormal practices in an asylum are for the most part much more rare than the laity, or even many physicians, imagine.” Cf. P. Näcke, “Some Psychologically Obscure Cases of Sexual Aberrations in the Asylum,” published in the Annual for Sexual Intermediate Stages, vol. v., p. 196 (Leipzig, 1903). See also, by the same author, “Problemi nel Campo delle Psicopatie Sessuali,” in Archivio delle Psicopatie Sessuali, 1896; “Sexual Perversities in the Asylum,” in the Wiener klinische Rundschau, 1899, Nos. 27-30.
[471] S. Freud, op. cit., pp. 19, 20.
[472] A. Hoche, “The Problem of the Forensic Condemnation of Sexual Transgressions,” published in the Neurologisches Centralblatt, 1896, p. 58.
[473] Ploss-Bartels, “Das Weib in der Natur- und Volkerkunde,” eighth edition, 2 vols. (Leipzig, 1906).
[474] Mantegazza, “Anthropological and Historical Studies on the Sexual Relationship of Mankind.”
[475] F. S. Krauss, “Morals and Customs relating to Sexual Reproduction among the Southern Slavs,” published in “Kryptadia,” vols. vi.-viii. (Paris, 1899-1902); and in the larger work, “Anthropophyteia” (Leipzig, 1904-1906).
[476] In all his works.
[477] Cf. Charles Darwin, “The Descent of Man, and Selection in Relation to Sex,” vol. i., p. 182 (2 vols., London, 1898).
[478] Cf. the inquiry of C. Wagner, containing extremely valuable material, “The Sexual and Moral Relationships of the Protestant Agricultural Population of the German Empire” (3 vols., Leipzig, 1897, 1898).
[479] “Prostitution in Berlin and its Victims,” p. 27 (Berlin, 1846).