The Descent of Man

horns of the female: see also his paper in 'Proceedings
of the Zoological Society,' 1866, p. 109.
Also Owen, 'Anatomy of Vertebrates,' vol. iii. p.
627), only a few of the females, about one in
five, have horns, and these are in a rudimentary
state, though sometimes above four inches
long: so that as far as concerns the possession of
horns by the males alone, this species is in an
intermediate condition, and the horns do not
appear until about five or six months after
birth. Therefore in comparison with what little
we know of the development of the horns in
other antelopes, and from what we do know
with respect to the horns of deer, cattle, etc.,
those of the prong-horned antelope appear at
an intermediate period of life,—that is, not very
early, as in cattle and sheep, nor very late, as in
the larger deer and antelopes. The horns of
sheep, goats, and cattle, which are well developed
in both sexes, though not quite equal in
size, can be felt, or even seen, at birth or soon
afterwards. (41. I have been assured that the