else uses the horse to secure a result which is advantageous by
making it advantageous to the horse to perform the act -- he gets
food, etc. But the horse, presumably, does not get any new
interest. He remains interested in food, not in the service he
is rendering. He is not a partner in a shared activity. Were he
to become a copartner, he would, in engaging in the conjoint
activity, have the same interest in its accomplishment which
others have. He would share their ideas and emotions.

Now in many cases -- too many cases -- the activity of the
immature human being is simply played upon to secure habits which
are useful. He is trained like an animal rather than educated
like a human being. His instincts remain attached to their
original objects of pain or pleasure. But to get happiness or to
avoid the pain of failure he has to act in a way agreeable to
others. In other cases, he really shares or participates in the
common activity. In this case, his original impulse is modified.
He not merely acts in a way agreeing with the actions of others,
but, in so acting, the same ideas and emotions are aroused in him
that animate the others. A tribe, let us say, is warlike. The
successes for which it strives, the achievements upon which it
sets store, are connected with fighting and victory. The
presence of this medium incites bellicose exhibitions in a boy,
first in games, then in fact when he is strong enough. As he
fights he wins approval and advancement; as he refrains, he is
disliked, ridiculed, shut out from favorable recognition. It is
not surprising that his original belligerent tendencies and
emotions are strengthened at the expense of others, and that his
ideas turn to things connected with war. Only in this way can he
become fully a recognized member of his group. Thus his mental