The rules of life prescribed for the priest of Jupiter, the Flamen Dialis, are given in part by Plutarch (_Q. R._ 40, 44, 50, 109, 110, 111, 112, and 113),[69] and are a signal instance of the necessity of explaining Roman cults, not by reference to the artificial mythology of the Vedas or to the civilised myths of Greece, but to the customs of peoples who are still steeped in animism. That a spirit may take up its abode as a Dryad in a tree or in an animal, as in the beasts worshipped by the ancient Egyptians, or may temporarily take possession of a human being, as Apollo possessed the Pythian priestess, is easily comprehended. But that a spirit should permanently dwell in a man, and that the man should exercise all the powers and receive all the worship that belong to the spirit, would be almost incredible were it not for the numerous instances of such worship collected by the erudition of Mr. Frazer.[70] In Japan the sun-goddess dwelt in the Mikado; in Lower Guinea and among the Zapotecs of South Mexico the sun-spirit takes human form. In Cambodia the spirit of fire and the spirit of water manifest themselves in the (human) kings of fire and water. Rain-kings are found on the Congo, the Upper Nile, and among Abyssinian tribes. The weather-spirit is worshipped in the kings of Loango, Mombaza, Quiteva, the Banjars, and the Muyscas. In the South Sea Islands, generally, "every god can take possession of a man and speak through him."[71] In the next place, these divine kings or priests are all charged with a force which enables them to control the course of Nature. Lest, therefore, this force should be inadvertently and unintentionally discharged, with results disastrous to the recipient of the shock or to the universe at large, the divine priest or king must be insulated. And this insulation is effected by taboos: every action is taboo to him which might bring him into dangerous contact with others.[72] When, therefore, we learn that the Flamen Dialis was subject to a very large number of taboos, all of which find analogies, while some find their exact counterparts, in the taboos laid on the divine priests and kings previously mentioned; and when we further discover that Preller,[73] on totally different grounds, considered the Flamen to have been "the living counterpart" of Jupiter, it seems not unreasonable to regard the Flamen Dialis as the human embodiment of the sky-spirit.