Any intense human feeling we call a passion, using the word to distinguish certain main lines of feeling common to us all, as “the maternal passion,” “the tender passion,” and those broad divisions Hate, Fear, Envy, Remorse, Ambition, Grief, Revenge. Also some special gust of intensity in minor lines of feeling is distinguished by the same word, “a passion of gratitude,” “a passion of loneliness,” “a passion of rebellion,” or of avarice. Our words climb slowly along the facts, changing as our perception changes, and always behind. Heat as a fact we observed and used long before we knew what to call it, if, indeed, what we call it now is any more true than it was before. But, whether “a fluid” named Caloric, or “a force” named Heat, the fact which we all know and use remains the same. It did its work in the world as fully before we came as after; before we named it at all as after. But to us, to our consciousness, the thing does not exist until we see it, and, seeing, name. “The maternal passion” is as strong a force in mother-wasp and mother-whale as in the most sophisticated and analytic mother-human. These passions are simply accumulations of stored energy along certain much-used lines, and serve to keep up a steady flow of the desired energy when there is no immediate stimulus to call for it. In the maternal passion, for instance, long ages of iron experience have developed a certain average of watchfulness and care even when the young are visibly safe, and a surprising fund of power and fury in defence of the young even when the exciting cause is comparatively small. It keeps up a safer average of care and defence than if the feeling were merely reactionary, and has therefore been developed in surviving species. Society, the vast and varied organism in which we live, calls for a devotion more single and fearless than that even of the mother; for a steady average of service and a sudden fund of fury in defence, a love and care and courage higher than any heretofore required; and as it needs such a feeling it gets it. Those societies having it most highly developed survive. We have called it many names; let us now give it another, the Social Passion. We are most familiar with its branches, minor and local, and with its blazing heights of expression; but the governing line of feeling is as simple as the animal mother’s. She, for the sake of race-preservation, must feed and guard and teach the young, therefore she manifests the maternal passion. We, for the sake of race-preservation, must feed and guard and teach each other, therefore we manifest the social passion.