principle of egoism largely obtains. The spiders are typical instances
of this: in their case the carrying out of the natural functions of
the male spider is attended with much danger for him, owing to the
fact that if he does not exercise the greatest care, he is apt to be
devoured immediately afterward by his female partner, in order that no
useful food matter may be lost. Yet even in the case of the spiders,
the female spider already gives proof of a certain capacity for
sacrifice where her young are concerned, at any rate for a short time
after they have crept from the egg.
In animals somewhat higher in the creative scale, more or less
powerful feelings of affection may develop out of their sex
association. There is affection on the part of the male for his mate,
and on the part of the female for her young. Often these feelings
develop into a strong, lasting affection between the sexes, and years
of what might be called faithful matrimonial union have been observed
in the case of birds. This in itself is sufficient to establish the
intimate relationship between love in a sex sense and love in a
general sense. And even in the animal creation we find the same
analogy existing between these feelings of sympathy and their
opposites which occur in the case of human beings. Every feeling of
attachment or sympathy existing between two individuals has a