The Descent of Man

many domesticated quadrupeds, certain characters,
apparently not derived through reversion
from any wild parent form, are confined to
the males, or are more developed in them than
in the females— for instance, the hump on the
male zebu-cattle of India, the tail of fat- tailed
rams, the arched outline of the forehead in the
males of several breeds of sheep, and lastly, the
mane, the long hairs on the hind legs, and the
dewlap of the male of the Berbura goat. (18. See
the chapters on these several animals in vol. i.
of my 'Variation of Animals under Domestication;'
also vol. ii. p. 73; also chap. xx. on the
practice of selection by semi-civilised people.
For the Berbura goat, see Dr. Gray, 'Catalogue,'
ibid. p. 157.) The mane, which occurs only in
the rams of an African breed of sheep, is a true
secondary sexual character, for, as I hear from
Mr. Winwood Reade, it is not developed if the
animal be castrated. Although we ought to be
extremely cautious, as shewn in my work on
'Variation under Domestication,' in concluding