Pra Rasi are, in the mythology of the Siamese, hermits who live in complete seclusion, and, by many years of a contemplative existence, have acquired a knowledge of the most recondite mysteries of nature. Those mysteries are described on the wall which encircles the world, and thence the Pra Rasi gathered their knowledge. Thus they possess the secret of flying, of assuming any form at their pleasure, of making precious metals, etc. As they know also the means of giving their body indefinite duration, they could enjoy eternal life; yet every thousand years they make a voluntary sacrifice of their life by burning themselves on a heap of wood, with the exception of one, who awakens the saints again to renewed life. There are religious writings which indicate the means of getting to these hermits, but it is said to be a very dangerous enterprise.