In the spirit-world there is a Ministry which controls all things connected with the waters on earth, salt or fresh. Its main divisions are the Department of Salt Waters, presided over by four Dragon-kings—those of the East, South, West, and North—and the Department of Sweet Waters, presided over by the Four Kings (Ssŭ Tu) of the four great rivers—the Blue (Chiang), Yellow (Ho), Huai, and Ch’i—and the Dragon-spirits who control the Secondary Waters, the rivers, springs, lakes, pools, rapids. Into the names and functions of the very large number of officials connected with these departments it is unnecessary to enter. It will be sufficient here to refer only to those whose names are connected with myth or legend.