The Yak then requested Buddh to preach a sermon for his benefit, but he refused, saying: “Another Buddh will come at some future time and do so.” Having said this, he departed on his merciful mission to the universe. When Gaudama the fourth Buddh came, he rested on the mango-tree, which had fallen down from age. On the Yak approaching to devour him, Gaudama remonstrated with him as the former Buddh had done, and told him that he was a Buddha. The Yak refusing to believe this, as the former Buddh was of enormous size, and Gaudama was small, Gaudama by his _aiswarya_ (supernatural power derived from accumulated merit) expanded to the size of the former Buddh. After the Yak had worshipped, and received Gaudama’s blessing, another of his tusks fell out, and after having some of the Buddh’s hair placed in it, was buried, like the first one, in the dragon’s hole. On the Yak asking Gaudama to preach him a sermon, he consented to do so if the Yak would build him a place of shelter, and fetch him some cool water. The Yak, calling two other friendly ogres to help him, at once made the sheltering-place; and proceeding a little distance to the south-east of the site of the monastery, dug the deep pool which is known as Nong Luang Kwang, and brought water for the Buddh to bathe and drink. Gaudama then preached a sermon, and foretold that the Yak in a future existence should be born chief of Zimmé, and the two friendly Yaks should be born kings of Siam, and their descendants should reign for many generations. When the prophecy was fulfilled, the Yak, who became in his after-existence King of Zimmé, built the great reclining image in Wat Pra Non. After preaching and prophesying, Gaudama left, and proceeded to Ko-sin-na-li, where he entered Neiban. Another peculiar belief of the people is in the power of snakes. _Naga_, or snake, worship, which was the State religion in Upper Burmah from A.D. 924 to A.D. 1010, still exists in the Shan States to the east of it, and even in Northern Siam. On one of his journeys in the Shan States, Dr Cushing found himself in an unpleasant predicament through killing a viper that he saw sunning itself on the bank of a lake. The Shans declared that it was the guardian spirit of the lake; it never bit any one, and had always been allowed to go and come when and where it liked.