Various motives induced various poets to assign, on various occasions the highest powers to this or the other god. The most antique legends were probably omitted or softened by some early Vedic bard (Rishi) of noble genius, or again impure myths were brought from the obscurity of oral circulation and foisted into literature by some poet less divinely inspired. Old deities were half-forgotten, and forgotten deities were resuscitated. Sages shook off superstitious bonds, priests forged new fetters on ancient patterns for themselves and their flocks. Philosophy explained away the more degrading myths; myths as degrading were suggested to dark and servile hearts by unscientific etymologies. Over the whole mass of ancient mythology the new mythology of a debased Brahmanic ritualism grew like some luxurious and baneful parasite. It is enough for our purpose if we can show that even in the purest and most antique mythology of India the element of traditional savagery survived and played its part, and that the irrational legends of the Vedas and Brahmanas can often be explained as relics of savage philosophy or faith, or as novelties planned on the ancient savage model, whether borrowed or native to the race. The oldest documents of Indian mythology are the Vedas, usually reckoned as four in number. The oldest, again, of the four, is the Sanhita ("collection") of the Rig-Veda. It is a purely lyrical assortment of the songs "which the Hindus brought with them from their ancient homes on the banks of the Indus". In the manuscripts, the hymns are classified according to the families of poets to whom they are ascribed. Though composed on the banks of the Indus by sacred bards, the hymns were compiled and arranged in India proper. At what date the oldest hymns of which this collection is made up were first chanted it is impossible to say with even approximate certainty. Opinions differ, or have differed, between 2400 B.C. and 1400 B.C. as the period when the earliest sacred lyrics of the Veda may first have been listened by gods and men. In addition to the Rig-Veda we have the Sanhita of the Sama-Veda, "an anthology taken from the Rik-Samhita, comprising those of its verses which were intended to be chanted at the ceremonies of the soma sacrifice".(1) It is conjectured that the hymns of the Sama-Veda were borrowed from the Rig-Veda before the latter had been edited and stereotyped into its present form. Next comes the Yajur-Veda, "which contains the formulas for the entire sacrificial ceremonial, and indeed forms its proper foundations," the other Vedas being devoted to the soma sacrifice.(2) The Yajur-Veda has two divisions, known as the Black and the White Yajur, which have common matter, but differ in arrangement. The Black Yajur-Veda is also called the Taittirya, and it is described as "a motley undigested jumble of different pieces".(3) Last comes Atharva-Veda, not always regarded as a Veda properly speaking. It