The Descent of Man

given by Mr. R. Sharpe, 'Proceedings of the
Zoological Society,' 1872, p. 496.)
These cases must not be confounded with those
where diseased or old females abnormally assume
masculine characters, nor with those
where fertile females, whilst young, acquire the
characters of the male, through variation or
some unknown cause. (32. Of these latter cases
Mr. Blyth has recorded (Translation of Cuvier's
'Regne Animal,' p. 158) various instances with
Lanius, Ruticilla, Linaria, and Anas. Audubon
has also recorded a similar case ('Ornitholog.
Biography,' vol. v. p. 519) with Pyranga aestiva.)
But all these cases have so much in common
that they depend, according to the hypothesis
of pangenesis, on gemmules derived from
each part of the male being present, though
latent, in the female; their development following
on some slight change in the elective affinities
of her constituent tissues.