+441+. Among the various relations that undeveloped communities sustain to nonhuman things totemism has the peculiarity that it is an alliance between a human group (clan or tribe) and a species of animals or plants, or an inanimate natural object (as sun or moon), or, rarely, an artificial object (usually an implement of labor).[789] The nonhuman thing is regarded as a friend, and is respected and cared for accordingly. When it is a species (animal or plant) every individual of the species is held to bear this friendly relation to every individual of the allied human group. Generally there is believed to be not only similarity or identity of nature between the two (such identity of nature between man and nonhuman things is everywhere an article of the creed of savages) but a special intimacy, commonly a kinship of blood. While the men of a group respect their ally, it, on its part, is supposed to refrain from injuring them, and even in some cases to aid them. It is credited with great power, such as in savage life all nonhuman things are supposed to possess. The members of the human group regard one another as brothers; this feeling, however, can hardly be said to be peculiar to totemic organizations--it exists, more or less, in all early associations, particularly in any one association as against others. +442+. While, therefore, we may take a certain clan alliance as a fundamental fact of totemism, we find in various communities other features of organization more or less closely combined with this into a social unity. In every such case it is necessary to inquire whether the feature in question is a universal or general accompaniment of clan alliance, and whether it is peculiar to the latter or is found in other systems also. +443+. (a) _Exogamy._ It is pointed out above[790] that totemism and exogamy are mutually independent arrangements, differing in function and origin, each being found without the other. Yet in many cases, perhaps in the majority of cases, the two are found combined. Exogamy supposes a body of clans, and, given a group of totemic clans, it would naturally be attached to these, and so become an organic part of their social constitution. Where there is no totemism the question of union, of course, does not come up. Where totemism is not accompanied by exogamy it is sometimes probable that the union of the two once existed,[791] or that exogamy is excluded by the peculiar form of the totemism.[792] Exogamy may thus be regarded as a natural and frequent accompaniment of totemism, but it is not a universal and necessary element of the totemic constitution.