The answer to this question requires a reference to the current theory of emotion. According to modern psychologists, emotion is constituted by the instinctive response to a situation; it is the feeling accompanying very complicated physical reactions, which have their roots in actions once useful in the history of mankind. Thus the familiar "expression" of anger, the flushed face, dilated nostril, clenched fist, are remains or marks of reactions serviceable in mortal combat. But these, the "coarser" bodily changes proper to anger, are accompanied by numberless organic reactions, the "feel" of all of which together is an indispensable element of the emotion of anger. The point to be noted in all this is that these reactions are ACTIONS, called up by something with which we literally HAVE TO DO. A person involved in real experience does not reproduce the emotions about him, for in real life he must respond to the situation, take an attitude of help, consolation, warning; and the character of these reactions determines for him an emotion of his own. Even though he really do nothing, the multitudinous minor impulses to action going to make up his attitude appreciably interfere with the reproduction of the reactions of the object of his interest. In an exactly opposite way the artificial conditions of the spectator at a play, which reinforce the vivid reproduction of ideas, and check action, stifle those emotions directed toward the players, the objective emotions of which we have spoken. The spectator is completely cut off from all possibilities of influence on events. Between his world and that across the footlights an inexpressible gulf is fixed. He cannot take an "attitude," he can have nothing to do in this galere. Since he may not act, even those beginnings of action which make the basis of emotion are inhibited in him. The spectator at a play experiences much more clearly and sharply than the sympathetic observer; only the proportions of his mental contents are different. This, I say, accounts for the absence of the real pity and fear, which were supposed to be directed toward the persons in the play. But so far as yet appears there is every reason to expect the sympathetic reproduction of the emotions of the persons themselves.