This minute inter-agreement of minds and wills, which forms the basis of the social life, even in troublous times--this presence of so many common ideas, ends, and means, in the minds and wills of all members of the same society at any given moment--is not due, I maintain, to organic heredity, which insures the birth of men quite similar to one another, nor to mere identity of geographical environment, which offers very similar resources to talents that are nearly equal; it is rather the effect of that suggestion-imitation process which, starting from one primitive creature possessed of a single idea or act, passed this copy on to one of its neighbors, then to another, and so on. Organic needs and spiritual tendencies exist in us only as potentialities which are realizable under the most diverse forms, in spite of their primitive similarity; and, among all these possible realizations, the indications furnished by some first initiator who is imitated determine which one is actually chosen.[37] In contrast with these schools, which interpret action in terms of the herd and the flock--i.e., men act together because they act alike--is the theory of Émile Durkheim who insists that the social group has real corporate existence and that, in human societies at least, men act together not because they have like purposes but a _common purpose_. This common purpose imposes itself upon the individual members of a society at the same time as an ideal, a wish and an obligation. Conscience, the sense of obligation which members of a group feel only when there is conflict between the wishes of the individual and the will of the group, is a manifestation, _in_ the individual consciousness, of the collective mind and the group will. The mere fact that in a panic or a stampede, human beings will sometimes, like the Gadarene swine, rush down a steep place into the sea, is a very positive indication of like-mindedness but not an evidence of a common purpose. The difference between an animal herd and a human crowd is that the crowd, what Le Bon calls the "organized crowd," the crowd "in being" to use a nautical term, is dominated by an impulse to achieve a purpose that is common to every member of the group. Men in a state of panic, on the other hand, although equally under the influence of the mass excitement, act not corporately but individually, each individual wildly seeking to save his own skin. Men in a state of panic have like purposes but no common purpose. If the "organized crowd," "the psychological crowd," is a society "in being," the panic and the stampede is a society "in dissolution."