The gregarious mind shows certain characteristics which throw some light on this phenomenon of the progressively enlarging unit. The gregarious animal is different from the solitary in the capacity to become conscious in a special way of the existence of other creatures. This specific consciousness of his fellows carries with it a characteristic element of communion with them. The individual knows another individual of the same herd as a partaker in an entity of which he himself is a part, so that the second individual is in some way and to a certain extent identical with himself and part of his own personality. He is able to feel with the other and share his pleasures and sufferings as if they were an attenuated form of his own personal experiences. The degree to which this assimilation of the interests of another person is carried depends, in a general way, on the extent of the intercommunication between the two. In human society a man’s interest in his fellows is distributed about him concentrically according to a compound of various relations they bear to him which we may call in a broad way their nearness. The centrifugal fading of interest is seen when we compare the man’s feeling towards one near to him with his feeling towards one farther off. He will be disposed, other things being equal, to sympathize with a relative as against a fellow-townsman, with a fellow-townsman as against a mere inhabitant of the same county, with the latter as against the rest of the country, with an Englishman as against a European, with a European as against an Asiatic, and so on until a limit is reached beyond {123} which all human interest is lost. The distribution of interest is of course never purely geographical, but is modified by, for example, trade and professional sympathy, and by special cases of intercommunication which bring topographically distant individuals into a closer grade of feeling than their mere situation would demand. The essential principle, however, is that the degree of sympathy with a given individual varies directly with the amount of intercommunication with him. The capacity to assimilate the interests of another individual with one’s own, to allow him, as it were, to partake in one’s own personality, is what is called altruism, and might equally well perhaps be called expansive egoism. It is a characteristic of the gregarious animal, and is a perfectly normal and necessary development in him of his instinctive inheritance.