The actual life conditions are different, and the habits of the species are correspondingly different.

So it is only another argument for the truth of this theory that we find just those games natural to the young which train them in the habits natural to the old.
This view is now being very generally adopted.

Many fine illustrations might be cited.

A simple case may be seen in so small a thing as the habit of leaping in play; the difference, for example, between the mountain goat and the common fawn.

The former, when playing on level ground makes a very ludicrous exhibition by jumping in little up-and-down leaps by which he makes no progress.