In drawing any deductions from the hymns of the Rig Veda it must be remembered that it is the manual of the Hotri priests[144]. This does not affect the age or character of the single pieces: they may have been composed at very different dates and they are not arranged in the order in which the priest recites them. But the liturgical character of the compilation does somewhat qualify its title to give a complete picture of religion. One could not throw doubt on a ceremony of the Church, still less on a popular custom, because it was not mentioned in the missal, and we cannot assume that ideas or usages not mentioned in the Rig Veda did not exist at the time when it was composed. We have no other Sanskrit writings contemporary with the older parts of the Rig Veda, but the roots of epic poetry stretch far back and ballads may be as old as hymns, though they neither sought nor obtained the official sanction of the priesthood. Side by side with Vedic tradition, unrecorded Epic tradition built up the figures of Siva, Râma and Krishna which astonish us by their sudden appearance in later literature only because their earlier phases have not been preserved. The Vedic hymns were probably collected and arranged between 1000 and 500 B.C. At that period rites and ceremonies multiplied and absorbed man's mind to a degree unparalleled in the history of the world and literature occupied itself with the description or discussion of this dreary ceremonial. Buddhism was a protest against the necessity of sacrifices and, though Buddhism decayed in India, the sacrificial system never recovered from the attack and assumed comparatively modest proportions. But in an earlier period, after the composition of the Vedic hymns and before the predominance of speculation, skill in ceremonial was regarded as the highest and indeed only science and the ancient prayers and poems of the race were arranged in three collections to suit the ritual. These were the Rig Veda, containing metrical prayers: the Yajur Veda (in an old and new recension known as the Black and the White) containing formulæ mainly in prose to be muttered during the course of the sacrifice: and the Sâma Veda, a book of chants, consisting almost entirely of verses taken from the Rig Veda and arranged for singing. The Rig Veda is clearly older than the others: its elements are anterior to the Brahmanic liturgy and are arranged in less complete subservience to it than in the Yajur and Sâma Vedas.