It usually happens that thought, by the innate faculty of which we have so often spoken, regards the ideas produced by this complex mental labour as material entities endowed with eternal and independent existence; and this produced the Platonic teaching, the schools in Greece and Italy, and other brilliant illustrations of this phase of thought. Such teaching, the result of explicit reflection, is a rival of the critical science which followed from it. It is always active, while constantly varying and assuming fresh forms; and it not only flourishes in our time in the religions in which it finds a suitable soil, but also, as we shall see, in science itself. In addition to this complex evolution of myth as a whole, special myths follow similar laws; since they are generated from the same facts, and pass through the same phases, they culminate in a partial ideality, and this involves a simple and comprehensive law of the phenomena in question, and even a moral or providential order. For example, we may trace the Promethean myth to the end of the Hellenic era, and the different phases and final extinction of this particular myth are quite apparent. The origin of the myth, which was directly connected with the perception of the natural phenomena of light and heat, was due to the same causes as all others, but we will consider it in its Vedic phase, as it may be gathered from tradition, and from the discoveries of comparative philology, and we have a sure guide in this research in the great linguist Kuhn, whose remarks have been enlarged and illustrated by Baudry.