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.
See Appendix A. "The Origins of the Kiss," in the previous volume.
See, e.g., Art. "Erection," by Retterer, in Richet's Dictionnaire de Physiologie, vol. v.
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.