Emotion is an arousing and energizing. It is perturbation, disturbance, agitation, excitement. It is a throwing open the throttle and putting on a full head of steam. The whole organism quivers with the sudden inflow of force and life, is quickened to its highest pressure. In all higher psychic life it is a driving force of the utmost importance. However, the trend of evolution is in the direction of economy, and with the highest forms of consciousness emotion accomplishes its work even before arriving at agitation intensity. Feeling of the emotion type, that is, representative, is always at first a rather intense perturbation. Fear, for example, is with the lower minds always fright; with higher minds it often appears as dread. I stand on the railway track when a train is approaching, and a slight fear enables me to take the self-conservative action of stepping from the track; but with my dog, in similar circumstances, I judge by his hasty jump and general expression that his fear is always more intense and more generally disturbing. Emotion being a force which quickly tends to exhaustion, it is obvious that those animals will, _ceteris paribus_, have the advantage which react with the least expenditure. Thus the tendency of evolution is away from intense emotionalism. In this emotion conforms to a general law. The earliest occurrences of any given form of psychosis are with strenuousness and with exaltation and excitement of the organism. We speak of fits of anger and gusts of passion, but for early consciousness we might also justly speak of fits of seeing and hearing. Common vision of external objects is for lower consciousness as rarely attained, and requires as much of force as beatific vision of seer and poet in the human mind. The new psychosis is but momentary, and implies high tension and great friction, but progress is toward continuity and ease of working. Emotion is in human life a tolerably constant element, like perception with whose representative side it is correlated, and within certain ranges it rises because of the force of heredity with apparent spontaneity. We remark that the social significance of emotion is embodied in the word _treat_, as _treat_ kindly, badly, etc. Our _treatment_ of each other always means activities inspired by some emotion.