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. 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 show, 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. First, then, trees or tree-spirits are believed to give rain and sunshine. When the missionary Jerome of Prague was persuading the heathen Lithuanians to fell their sacred groves, a multitude of women besought the Prince of Lithuania to stop him, saying that with the woods he was destroying the house of god from which they had been wont to get rain and sunshine. The Mundaris in Assam think that if a tree in the sacred grove is felled the sylvan gods evince their displeasure by withholding rain. In order to procure rain the inhabitants of Monyo, a village in the Sagaing district of Upper Burma, chose the largest tamarind-tree near the village and named it the haunt of the spirit (_nat_) who controls the rain. Then they offered bread, coco-nuts, plantains, and fowls to the guardian spirit of the village and to the spirit who gives rain, and they prayed, "O Lord _nat_ have pity on us poor mortals, and stay not the rain. Inasmuch as our offering is given ungrudgingly, let the rain fall day and night." Afterwards libations were made in honour of the spirit of the tamarind-tree; and still later three elderly women, dressed in fine clothes and wearing necklaces and earrings, sang the Rain Song.