H.A. Marshall, _Philosophical
Transactions_, 1903, vol. B. 196; also Marshall and Jolly, id., 1905, B.
198). Cf. C.J. Bond, "An Inquiry Into Some Points in Uterine and Ovarian
Physiology and Pathology in Rabbits," _British Medical Journal_, July 21,
1906.
[101] Pouchet, _Theorie de l'Ovulation Spontanee_, 1847. As Blair Bell and
Pontland Hick remark ("Menstruation," _British Medical Journal_, March 6,
1909), the repeated oestrus of unimpregnated animals (once a fortnight in
rabbits) is surely comparable to menstruation.
[102] Tait, _Provincial Medical Journal_, May, 1891; J. Beard, _The Span
of Gestation_, 1897, p. 69. Lawson Tait is reduced to the assertion that
ovulation and menstruation are identical.
[103] As Moll points out, even the secondary sexual characters have
undergone a somewhat similar change. The beard was once an important
sexual attraction, but men can now afford to dispense with it without fear
of loss in attractiveness. (_Libido Sexualis_, Band I, p. 387.) These
points are discussed at greater length in the fourth volume of these
_Studies_, "Sexual Selection in Man."
[104] It is not absolutely established that in menstruating animals the
period of menstruation is always a period of sexual congress; probably
not, the influence of menstruation being diminished by the more
fundamental influence of breeding seasons, which affect the male also;
monkeys have a breeding season, though they menstruate regularly all the
year round.
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