To how large a group the individual can respond with spontaneous and instinctive loyalty is questionable. The small child throws out his arms and exclaims passionately, "I love the whole world." Auguste Comte could be imbued with a fervor for "humanity" in the abstract. The idea of a League of Nations arouses in some minds a passionate devotion to a world order that to those themselves habituated to an intense loyalty to the national group seems incredible. Certainly it is true that we rapidly outgrow that state of mind common to enthusiastic adolescence when we can develop a love for the universe in the abstract. The instinct of gregariousness seems unquestionably to be most intense where there is intimacy and vividness of group association. The primary groups, as Professor Ross calls them, are face-to-face associations, the family, the play group, the neighborhood group. If "world patriotism" is a possibility, it is because rapid communication and the frequency of travel, and the education of the industrial classes to "the international mind" tend to break down barriers and to make distant countries and persons vivid and directly imaginable. But there seems to be no substitute for direct personal contact. Even devotion to a country tends to take the form of phrases, places, persons, and symbols, to which we have been familiarized. GREGARIOUSNESS IMPORTANT FOR SOCIAL SOLIDARITY. The gregarious instinct, powerful as it is, is of the greatest significance for social solidarity, and, if misdirected, for seriously limiting it. It is, in the first place, the trait without which social solidarity would be almost impossible. "In early times when population was scanty, it must have played an important part in social evolution by keeping men together, and thereby occasioning the need for social laws and institutions."[1] The coherence of national, political, or religious groups depends primarily on the extent to which the gregarious instinct may be aroused. Allegiance to a group may, of course, be secured through participation in common ideals. This is illustrated in the case of the numerous literary and scientific associations that cut across national boundaries and knit into groups similarly interested persons all over the world. Groups may, again, be formed through common economic interests, as in the case of labor unions, or employers' associations. Groups may be knit and strengthened through law and custom. And all these factors play a smaller or larger part in any important grouping of men in contemporary society. But unless there is, on the part of the members of the group, a deep-seated emotional attachment to the group itself, solidarity will be very precarious. The intensity and solidarity, of feeling exhibited so markedly during war-time is made possible by the intense excitability of this instinct when the group is under conditions of stress or danger. Any scheme for enlisting a great number of individuals in modern society in a