Brief introduction of Huang Ji's practical ancient books.

Xiangchun font Yuan, No.,is from Pu 'er. It promoted the old theory of "Huang Ji Jing Shi" and established the method of divination, but only discussed the generation of grams by dry branches and the generation of grams by five elements. Experts in Fang Jia are not talking about Yi. Claiming to be six volumes, Deng Shifang named eight volumes in sequence in the second year of Qin Long, which is consistent with this book. According to Ten Prefaces, the book was carved in Dali and later in the capital. In Wuding, people who were unprepared a moment ago were carved. The preface of Gai was written at the beginning, and the original ear was added.