an analogous nature in the human species.

On the other hand, with male animals, it is notorious that the secondary
sexual characters are more or less completely lost when they are subjected to
castration. Thus, if the operation be performed on a young cock, he never, as
Yarrell states, crows again; the comb, wattles, and spurs do not grow to their
full size, and the hackles assume an intermediate appearance between true
hackles and the feathers of the hen. Cases are recorded of confinement, which
often affects the reproductive system, causing analogous results. But
characters properly confined to the female are likewise acquired by the male;
the capon takes to sitting on eggs, and will bring up chickens; and what is
more curious, the utterly sterile male hybrids from the pheasant and the fowl
act in the same manner, "their delight being to watch when the hens leave
their nests, and to take on themselves the office of a sitter." (13/57.
'Cottage Gardener' 1860 page 379.) That admirable observer Reaumur (13/58.
'Art de faire Eclore' etc. 1749 tome 2 page 8.) asserts that a cock, by being
long confined in solitude and darkness, can be taught to take charge of young
chickens; he then utters a peculiar cry, and retains during his whole life
this newly acquired maternal instinct. The many well-ascertained cases of
various male mammals giving milk shows that their rudimentary mammary glands
retain this capacity in a latent condition.

We thus see that in many, probably in all cases, the secondary characters of
each sex lie dormant or latent in the opposite sex, ready to be evolved under
peculiar circumstances. We can thus understand how, for instance, it is
possible for a good milking cow to transmit her good qualities through her
male offspring to future generations; for we may confidently believe that
these qualities are present, though latent, in the males of each generation.
So it is with the game-cock, who can transmit his superiority in courage and
vigour through his female to his male offspring; and with man it is known