In short, he imitates.
But how, it may be objected, does evolution take place, if every one imitates every one else?
Certainly, it looks at first sight like a vicious circle.

Nevertheless, there is room for a certain progress, or at any rate for a certain process of change.

To analyse its psychological springs would take us too long.

If a phrase will do instead of an explanation, we may sum them up, with the brilliant French psychologist, Tarde, as "a cross-fertilization of imitations." We need not, however, go far to get an impression of how this process of change works.

It is going on every day in our midst under the name of "change of fashion." When one purchases the latest thing in ties or straw hats, one is not aiming at a rational form of dress.