[Sidenote: Transition of tree-spirit into anthropomorphic deity of the woods.] When a tree comes to be viewed, no longer as the body of the tree-spirit, but simply as its abode which it can quit at pleasure, an important advance has been made in religious thought. Animism is passing into polytheism. In other words, instead of regarding each tree as a living and conscious being, man now sees in it merely a lifeless, inert mass, tenanted for a longer or shorter time by a supernatural being who, as he can pass freely from tree to tree, thereby enjoys a certain right of possession or lordship over the trees, and, ceasing to be a tree-soul, becomes a forest god. As soon as the tree-spirit is thus in a measure disengaged from each particular tree, he begins to change his shape and assume the body of a man, in virtue of a general tendency of early thought to clothe all abstract spiritual beings in concrete human form. Hence in classical art the sylvan deities are depicted in human shape, their woodland character being denoted by a branch or some equally obvious symbol.[181] But this change of shape does not affect the essential character of the tree-spirit. The powers which he exercised as a tree-soul incorporate in a tree, he still continues to wield as a god of trees. This I shall now attempt to prove in detail. I shall shew, first, that trees considered as animate beings are credited with the power of making the rain to fall, the sun to shine, flocks and herds to multiply, and women to bring forth easily; and, second, that the very same powers are attributed to tree-gods conceived as anthropomorphic beings or as actually incarnate in living men.