others, there can be no doubt that peculiarities first appearing in either
sex, though not in any way necessarily or invariably connected with that sex,
strongly tend to be inherited by the offspring of the same sex, but are often
transmitted in a latent state through the opposite sex.

Turning now to domesticated animals, we find that certain characters not
proper to the parent species are often confined to, and inherited by, one sex
alone; but we do not know the history of the first appearance of such
characters. In the chapter on Sheep, we have seen that the males of certain
races differ greatly from the females in the shape of their horns, these being
absent in the ewes of some breeds; they differ also in the development of fat
in the tail and in the outline of the forehead. These differences, judging
from the character of the allied wild species, cannot be accounted for by
supposing that they have been derived from distinct parent forms. There is,
also, a great difference between the horns of the two sexes in one Indian
breed of goats. The bull zebu is said to have a larger hump than the cow. In
the Scotch deer-hound the two sexes differ in size more than in any other
variety of the dog (14/28. W. Scrope 'Art of Deer Stalking' page 354.) and,
judging from analogy, more than in the aboriginal parent-species. The peculiar
colour called tortoise-shell is very rarely seen in a male cat; the males of
this variety being of a rusty tint.

In various breeds of the fowl the males and females often differ greatly; and
these differences are far from being the same with those which distinguish the
two sexes of the parent-species, the Gallus bankiva; and consequently have
originated under domestication. In certain sub-varieties of the Game race we
have the unusual case of the hens differing from each other more than the
cocks. In an Indian breed of a white colour shaded with black, the hens
invariably have black skins, and their bones are covered by a black
periosteum, whilst the cocks are never or most rarely thus characterised.