fight, to herd together, to reproduce themselves, to care for their young, and to do various other things which make for the well-being or preservation of the race. The individuals that did these things at the right time survived and passed on to their offspring an inherited tendency to this kind of reaction. McDougall defines an instinct as "an inherited or innate psycho-physical disposition which determines its possessor to perceive or pay attention to objects of a certain class, to experience an emotional excitement of a particular quality upon perceiving such an object, and to act in regard to it in a particular manner, or at least to experience an impulse to such action." This is just what an instinct is,—an inherited disposition to notice, to feel, and to want to act in certain ways in certain situations. It is the something which makes us act when we cannot explain why, the something that goes deeper than reason, and that links us to all other human beings,—those who live to-day and those who have gone before.
It is true that East is East and West is West, but the two do meet in the common foundation of our human nature. The likeness between men and between races is far greater and far more fundamental than the differences can ever be.
Firing Up the Engine. Purpose is writ large across the face of an instinct, and that purpose is always toward action. Whenever a situation arises which
demands instantaneous action, the instinct is the means of securing it. Planted within the creature is a tendency which makes it perceive and feel and act in the appropriate way. It will be noticed that there are three distinct parts to the process, corresponding to intellect, emotion, will. The initial intellectual part makes us sensitive to certain situations, makes us recognize an object as meaningful and significant, and waves the flag for the emotion; the emotion fires up the engine, pulls the levers all over the body that release its energy and get it ready for action, and pushes the button that calls into the mind an intense, almost irresistible desire or impulse to act. Once aroused, the emotion and the impulse are not to be changed. In man or beast, in savage or savant, the intense feeling, the marked bodily changes, and the yearning for action are identical and unchangeable. The brakes can be put on and the action suppressed, but in that case the end of the whole process is defeated. Could anything be plainer than that an instinct and its emotion were never intended to be aroused except in situations in which their characteristic action is to be desired? An emotion is the hot part of an instinct and exists solely for securing action. If all signs of the emotion are to be suppressed, all expression denied, why the emotion?
But although the emotion and the impulse, once aroused, are beyond control, there is yet one part of
the instinct that is meant to be controlled. The initial or receptive portion, that which notices a situation, recognizes it as significant, and sends in the signal for action, can be trained to discrimination. This is where reason comes in. If the situation calls for flight, fear is in order; if it calls for fight, anger is in order; if it calls for examination, wonder is in order; but if it calls for none of these things, reason should show some discrimination and refuse to call up the emotion.
The Right of Way. There is a law that comes to the aid of reason in this dilemma and that is the "law of the common path." [7] By this is meant that man is capable of but one intense emotion at a time. No one can imagine himself strenuously making love while he is shaken by an agony of fear, or ravenously eating while he is in a passion of rage. The stronger emotion gets the right of way, obtains control of mental and bodily machinery, and leaves no room for opposite states. If the two emotions are not antagonistic, they may blend together to form a compound emotion, but if in the nature of the case such a blending is impossible, the weaker is for the time being forgotten in the intensity of the stronger. "The expulsive power of a new affection" is not merely a happy phrase; it is a fact in every day life. The problem, then, resolves itself into ways of making the desirable emotion the
stronger, of learning how to form the habit of giving it the head start and the right of way. In our chapter on "Choosing the Emotions," we shall find that much depends on building up the right kind of sentiments, or the permanent organization of instincts around ideas. However, we must first look more closely at the separate instincts to acquaint ourselves with the purpose and the ways of each, and to discover the nature of the forces with which we have to deal.
[7] ] Sherrington: Integrative Action of the Nervous System.
I The Self-Preservative Instincts