“Unaccommodated man” was, to begin with, in relations more hostile than friendly. The struggle for food was so serious a fact, and predaceousness to such a degree the habit of life, that a suspicious, hostile, and hateful state of mind was the rule, with exceptions only in the cases where truce, association, and alliance had come about in the course of experience. This was still the state of affairs in so advanced a stage of development as the Indian society of North America, where a tribe was in a state of war with every tribe with which it had not made a treaty of peace; and it is perhaps true, generally speaking, of men today, that they regard others with a degree of distrust and aversion until they have proved themselves good fellows. What, indeed, would be the fate of a man on the streets of a city if he did otherwise? There has, nevertheless, grown up an intimate relation between man and certain portions of his environment; and this includes, not only his wife and children, his dog and his blood-brother, but, with lessening intensity, the members of his clan, tribe, and nation. These become, psychologically speaking, a portion of himself, and stand with him against the world at large. From the standpoint here outlined, prejudice or its analogue is the starting-point, and our question becomes one of the determination of the steps of the process by which man mentally allied with himself certain portions of his environment to the exclusion of others.