In the _Rigveda_ the soul of the dead proceeds at once, or at any rate after burial, towards the next world. In one passage only is it spoken of “as departing to the waters or the plants”, and this reference, Professor Macdonell suggests,[38] “may contain the germs of the theory” of transmigration. In the speculative prose treatises, the _Upanishads_, which were composed in the Middle Country, the doctrine of metempsychosis is fully expounded. It does not follow, however, that it originated in India although it may have obtained there unrecognized by the priestly poets who composed the hymns to the deities, long before it became an essential tenet of orthodox or official religion. Other representative communities of the Brown race professed this doctrine which appears to have evolved from the vague belief shared by more than one primitive race, that the souls of the dead, and especially of dead children, were ever on the outlook for suitable mothers. Even in Central Australia a particular tribe has perpetuated “the germs of the theory”, which may also be traced in the widespread custom of visiting standing stones at a certain phase of the moon to perform a ceremony so that offspring may be obtained. The Upanishadic doctrine of metempsychosis is less likely to have been so much coincidental as racial when we find that it is restricted to those areas where definite racial influences must have been at work. The Greeks believed in transmigration. So did also a section of the Egyptian people as Herodotus has stated and as is proved by references in folk-tales, temple chants and inscriptions.[39] As we show (Chapter VI), the Irish conception closely resembled the Indian, and it also obtained among the Gauls. There is no trace, however, that the Teutonic peoples were acquainted with the fully developed doctrine of metempsychosis; the souls of the dead departed immediately to Valhal, Hela, or the loathsome Nifelhel. [38] _A History of Sanskrit Literature_, p. 115. [39] See _Egyptian Myth and Legend_. The doctrine of the world's ages is common to the Indian, Greek, and Irish mythologies, but is not found in Teutonic mythology either.[40] There are indications that it may have at one time obtained in Egypt, for there was an Age of Ra, then a deluge, an Age of Osiris, an Age of Set, &c.; but the doctrine, like other conceptions in Egypt, probably suffered from the process of priestly transformation in the interests of sectarian propaganda. [40] The “Golden Age” of the gods, and the regeneration of the world after Ragnarok, do not refer to the doctrine of the world's ages as found in other mythologies.