The Ribhus and Twashtri were the artisans of nature, the spirits of growth, the genii of the seasons, the elves of earth and air. Indra's close association with them emphasizes his character as a god of fertility, who brought the quickening rain, and as the corn god, and the rice god. He was the son of Father Heaven and Mother Earth, two vague deities who were never completely individualized, but were never forgotten. Heaven was the sky-god Dyaus-pita (from div = to shine), the Zeus pater of the Greeks, Jupiter of the Romans, and Tivi[57] (later, Odin) of the Germanic peoples, whose wife was the earth-goddess Jord, mother of Thor. The Hindu earth-mother (Terra mater) was Prithivi. Dyaus is sometimes referred to as a ruddy bull, whose bellowing is the thunder; as the Night heaven he is depicted as a black steed decked with pearls which are the stars; in one of the Vedic hymns reference is made to his “thunderstone”. Prithivi, who is sometimes symbolized as a cow, is the source of all vegetation, the supporter of earth, the female principle. She never assumes the importance of the Assyrian Ishtar, or the north Egyptian “earth-mother” Neith, or the “earth-mothers” of Europe. The Vedic Aryans were Great Father worshippers rather than Great Mother worshippers: their female deities were Night, Dawn, Earth, and the Rivers, but they were not sharply individualized until late; they are vague in the Vedas. [57] An old Germanic name of Odin related to Divus. Odin's descendants were the “Tivar”. (Pronounce _Dyaus_ as one syllable rhiming with _mouse_.) As the Greek Cronus (Roman Saturn) slew his father Urănus (Heaven), so did Indra slay his father Dyaus (Heaven). His earth-mother addresses him, saying: “Who has made thy mother a widow? Who has sought to slay the sleeping and the waking? What deity has been more gracious than thou, since thou hast slain thy father, having seized him by the foot?”[58] [58] _Rigveda_, iv, 18. Wilson, vol. iii, p. 153. The Indian father-slaying myth appears to be connected with the doctrine of reincarnation. In the _Laws of Manu_ it is stated that “the husband, after conception by his wife, becomes an embryo and is born again of her; for that is the wifehood of a wife, that he is born again by her”.[59] In the famous story of Shakuntălā, the husband is similarly referred to as the son of his wife, the son being a reincarnation of the father.[60] This belief resembles the Egyptian conception which is summed up in the phrase “husband of his mother”.[61] [59] _The Laws of Manu_, ix, 8; p. 329. (_Sacred Books of the East_, vol. xxv.) [60] _Adi Parva_, sect. lxxiv of _Mahabharata_, Roy's translation. [61] See _Egyptian Myth and Legend_.