When Duke Huan was out hunting, with Kuan Chung as his charioteer, he saw a bogy. Catching hold of Kuan Chung's hand, he asked him, saying, "What do you see?"
"I see nothing," replied Kuan Chung. But when the Duke got home he became delirious, and for many days was unable to go out.
There came a certain Huang Tzŭ Kao Ngao of the Ch'i State
"A sage of the Ch'i State,"—as the commentators usually say when in reality they know nothing about the individual.
and said, "Your Highness is self-injured. How could a bogy injure you? When the vital strength is dissipated in anger, and is not renewed, there is a deficiency. When its tendency is in one direction upwards, the result is to incline men to wrath. When its tendency is in one direction downwards, the result is loss of memory. When it remains stagnant, in the middle of the body, the result is disease."
"Very well," said the Duke, "but are there such things as bogies?"
"There are," replied Huang. "There is the mud spirit Li; the fire spirit Kao; Lei T'ing, the spirit of the dust-bin; P'ei O and Wa Lung, sprites of the north-east; Yi Yang of the north-west; Wang Hsiang of the water; the Hsin of the hills; the K'uei of the mountain; the P'ang Huang of the moor; the Wei I of the marsh."
The garb and bearing of the above beings are very fully described by commentators.
"And what may the Wei I be like?" asked the Duke.