For example, there is a certain kind of mountain snail mentioned later, which is born in the mountain rocks and is a rare mountain treasure. If it is caught, dried and ground, it can be taken for a penny a day for half a month, and it can prolong life for five years.

The more Wang Xuan looked at it, the more he didn't believe it. He looked through the Compendium of Materia Medica in his spare time, but he had never seen these weird things at all.

Old colleague Chen Yongjie said: "Don't believe me, these things are recorded in Taoist ancestral courts and Buddhist ancient temples. This book is just a summary, and some strange things mentioned in the pre-Qin bamboo slips are added."