The little chick, for example, does not know the value of water when he sees it, as essential as water is to his life; but he depends upon imitation of his mother's drinking, or upon the mere accident of wetting his bill, to stimulate his partial instinct of drinking in the peculiar fashion characteristic of fowls, by throwing back the head.

So in other functions which are peculiar to a species and upon which their very lives depend, we find the delicate adjustment between intelligent adaptation by conscious action and the partially formed instincts which the creatures possess.
In the theory of Organic Selection, therefore, we seem to have a positive solution of the question of the origin of instinct.

It is capable of a similar application in other cases where evolution has taken certain definite directions, seemingly guided by intelligence.
It shows us that mind has had a positive place in the evolution of organic nature.
* * * * * _Animal Intelligence._--Coming to consider what further equipment the animals have, we light upon the fact just spoken of when we found it necessary to appeal in some measure to the animal's Intelligence to supplement his instincts.

What is meant by Intelligence?
This word may be used in the broad sense of denoting all use of consciousness, or mind, considered as a thing in some way additional to the reflexes of the nervous system.

In the life of the animal, as in that of man, wherever we find the individual doing anything with reference to a mental picture, using knowledge or experience in any form, then he is said to be acting intelligently.
The simplest form of intelligent action in the animal world and that from which most of the higher forms have arisen is illustrated in the following example: a chick will peck at a strange worm, and, finding it unpalatable, will then in the future refuse to peck at worms of that sort.