We must remember that it does not follow that any mythical ideas are later than the age of Homer because we first meet them in poems of a later date. We have already seen that though the Brahmanas are much later in date of compilation than the Veda, yet a tradition which we first find in the Brahmanas may be older than the time at which the Veda was compiled. In the same way, as Mr. Max Muller observes, "we know that certain ideas which we find in later writers do not occur in Homer. But it does not follow at all that such ideas are all of later growth or possess a secondary character. One myth may have belonged to one tribe; one god may have had his chief worship in one locality; and our becoming acquainted with these through a later poet does not in the least prove their later origin."(1) (1) Hibbert Lectures, pp. 130, 131. After Homer and Hesiod, our most ancient authorities for Greek cosmogonic myths are probably the so-called Orphic fragments. Concerning the dates and the manner of growth of these poems volumes of erudition have been compiled. As Homer is silent about Orpheus (in spite of the position which the mythical Thracian bard acquired as the inventor of letters and magic and the father of the mysteries), it has been usual to regard the Orphic ideas as of late introduction. We may agree with Grote and Lobeck that these ideas and the ascetic "Orphic mode of life" first acquired importance in Greece about the time of Epimenides, or, roughly speaking, between 620 and 500 B.C.(1) That age certainly witnessed a curious growth of superstitious fears and of mystic ceremonies intended to mitigate spiritual terrors. Greece was becoming more intimately acquainted with Egypt and with Asia, and was comparing her own religion with the beliefs and rites of other peoples. The times and the minds of men were being prepared for the clear philosophies that soon "on Argive heights divinely sang". Just as, when the old world was about to accept Christianity, a deluge of Oriental and barbaric superstitions swept across men's minds, so immediately before the dawn of Greek philosophy there came an irruption of mysticism and of spiritual fears. We may suppose that the Orphic poems were collected, edited and probably interpolated, in this dark hour of Greece. "To me," says Lobeck, "it appears that the verses may be referred to the age of Onomacritus, an age curious in the writings of ancient poets, and attracted by the allurements of mystic religions." The style of the surviving fragments is sufficiently pure and epic; the strange unheard of myths are unlike those which the Alexandrian poets drew from fountains long lost.(2) But how much in the Orphic myths is imported from Asia or Egypt, how much is the invention of literary forgers like Onomacritus, how much should be regarded as the first guesses of the physical poet-philosophers, and how much is truly ancient popular legend recast in literary form, it is impossible with certainty to determine.