of the lives of young mammals that the mothers should have an adequate
motive in pleasurable sensation for enduring the trouble of suckling. The
most obvious method for obtaining the necessary degree of pleasurable
sensation lay in utilizing the reservoir of sexual emotion, with which
channels of communication might already be said to be open through the
action of the sexual organs on the breasts during pregnancy. The
voluptuous element in suckling may thus be called a merciful provision of
Nature for securing the maintenance of the child.

Cabanis seems to have realized the significance of this
connection as the basis of the sympathy between mother and child,
and more recently Lombroso and Ferrero have remarked (_La Donna
Delinquente_, p. 438) on the fact that maternal love has a sexual
basis in the element of venereal pleasure, though usually
inconsiderable, experienced during suckling. Houzeau has referred
to the fact that in the majority of animals the relation between
mother and offspring is only close during the period of
lactation, and this is certainly connected with the fact that it
is only during lactation that the female animal can derive
physical gratification from her offspring. When living on a farm
I have ascertained that cows sometimes, though not frequently,
exhibit slight signs of sexual excitement, with secretion of
mucus, while being milked; so that, as the dairymaid herself
observed, it is as if they were being "bulled." The sow, like
some other mammals, often eats her own young after birth,
mistaking them, it is thought, for the placenta, which is
normally eaten by most mammals; it is said that the sow never
eats her young when they have once taken the teat.

It occasionally happens that this normal tendency for suckling to