The elements furnished by the sense of touch in sexual selection have been discussed in the first section of the previous volume of these Studies.

[99]

See Appendix A. "The Origins of the Kiss," in the previous volume.

[100]

See, e.g., Art. "Erection," by Retterer, in Richet's Dictionnaire de Physiologie, vol. v.

[101]

Guibaut, Traité Clinique des Maladies des Femmes, p. 242. Adler discusses the sexual secretions in women and their significance, Die Mangelhafte Geschlechtsempfindung des Weibes, pp. 19-26.