+225+. The lowest tribes known to us regard the whole world of nature and the human dead as things to be feared and usually as things to be propitiated. In most cases they conceive of some anthropomorphic being as the creator or arranger of the world. But in all cases they regard animals, plants, and inanimate objects as capable of doing extraordinary things. All these beings they think of as akin to men; transformations from human to nonhuman and from nonhuman to human are believed to be possible and frequent. +226+. From the point of view of the savage mind this theory of the world is inevitable. Ignorant of what we call natural law, they can see no reason why the phenomena of life should not be under the control of any of the powers known to them; and for sources of power they look to the things around them. All objects of nature are mysterious to the savage--stones, hills, waters, the sky, the heavenly bodies, trees, plants, fishes, birds, beasts, are full of movement, and seemingly display capacities that induce the savage to see in them the causes of things. Since their procedures seem to him to be in general similar to his own, he credits them with a nature like his own. As they are mysterious and powerful, he fears them and tries to make allies of them or to ward off their injurious influences. +227+. But while he excludes nothing from his list of possible powers, he is vitally interested only in those objects with which he comes into contact, and he learns their powers by his own experience or through the wisdom inherited from his forefathers. His procedure is strictly scientific; he adopts only what observation has shown him and others to be true. Different tribes are interested in different things--some are indifferent to one thing, others to another, according to the topographical and economic milieu. The savage is not without discrimination. He is quite capable of distinguishing between the living and the dead. Not all stones are held by him to be alive in any important sense, and not all beasts to be powerful. He is a practical thinker and deals with each phenomenon as it presents itself, and particularly as it shows itself to be connected with his interests. He is constantly on the alert to distinguish between the profitable and the unprofitable, the helpful and the injurious. He himself is the center of his whole scientific and religious system, and the categories into which he divides all things are determined by his own sense of self-interest.[428]