[6] Steinach, "Utersuchungen zu vergleichende Physiologie," _Archiv fuer
die Gesammte Physiologie_, Bd. lvi, 1894, p. 320.
[7] Fere, _Comptes-rendus Societe de Biologie_, July 30, 1898. We may
perhaps connect this with an observation of E. Selous (_Zooelogist_, May
and Sept., 1901) on a bird, the Great Crested Grebe; after pairing, the
male would crouch to the female, who played his part to him; the same
thing is found among pigeons. Selous suggests that this is a relic of
primitive hermaphroditism. But it may be remembered that in the male
generally sexual intercourse tends to be more exhausting than in the
female; this fact would favor a reversion of their respective parts.
[8] E. Selous, "Sexual Selection in Birds," _Zooelogist_, Feb., 1907, p.
65; ib., May, p. 169. Sexual aberrations generally are not uncommon among
birds; see, e.g., A. Heim, "Sexuelle Verirrungen bei Voegeln in den
Tropen," _Sexual-Probleme_, April, 1913.
[9] See Moll, _Untersuchungen ueber die Libido Sexualis_, 1898, Bd. i, pp.
369, 374-5. For a summary of facts concerning homosexuality in animals see
F.
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