uman
species that the tendency to limitation of offspring is most
marked, combined at the same time with a greater aptitude for
impregnation than exists among any lower mammals. It is here,
therefore, that a physical check is of most value, and
accordingly we find that in woman alone, of all animals, is the
hymen fully developed.

FOOTNOTES:

[72] "Analysis of the Sexual Impulse," in vol. iii of these _Studies_.

[73] "The accomplishment of no other function," Hyrtl remarks, "is so
intimately connected with the mind and yet so independent of it."

[74] The process is still, however, but imperfectly understood; see Art.
"Fecondation," by Ed. Retterer, in Richet's _Dictionnaire de Physiologie_,
vol. vi, 1905.

[75] Thus a male foetus showing reptilian characters in sexual ducts was
exhibited by Shattock at the Pathological Society of London, February 19,
1895.

[76] J. Kohlbrugge, "Die Umgestaltung des Uterus der Affen nach den
Geburt," _Zeitschrift fuer Morphologie_, bd. iv, p. 1, 1901.

[77] There are, however, no special nerve endings (Krause corpuscles), as
was formerly supposed. The nerve endings in the genital region are the
same as elsewhere. The difference lies in the abundance of superposed
arboreal ramifications. See, e.g., Ed. Retterer, Art. "Ejaculation,"
Richet's _Dictionnaire de Physiologie_, vol. v.

[78] Hyrtl, _Op. cit._, vol. ii, p. 39.

[79] Sensations of pleasure without those of touch appear to be normal at
the tip of the penis, as pointed out by Scripture, quoted in _Alienist and
Neurologist_, January, 1898.

[80] See the previous volume of these _Studies_, "Sexual Selection in
Man," p. 161.

[81] See, e.g., Ploss and Bartels, _Das Weib_, vol. i, beginning of
chapter VI.

[82] Hyrtl states that the name _labia_ was first used by Haller in the
middle of the eighteenth century in his _Elements of Physiology_, being
adopted by him from the Greek poet Erotion, who gave these structures the
very obvious name cheilea, lips. But this seems to be a mistake, for the
seventeenth century anatomists certainly used the name "labia" for these
parts.

[83] Bergh tentatively suggests, as regards the pubic hair, that its
appearance may be due to the upright walk in man and the human position
during coitus, the hair preventing irritation of the genitals from the
sweat pouring down from the body and protecting the skin from direct
friction in coitus. (In both these suggestion