1851

Tu Su said: "the cold region is dominated by cold. Most of the monks are cold secret methods. The colder the place is, more practitioners will go there. Like the place where we are now, generally no one practices here, most of them are trying to go to a colder place. The coldness of glaciers can be distinguished by the color of glacial continent. "

"red, black and purple are the three coldest expressions. In this cold region, only the three places mentioned above are of these three colors. Moreover, these three places are in three corners of the cold region, far apart." Tu Su said, "so most people...