Three volumes. Based on the pharmacological discussions in the Neijing, as well as Zhang Jie-gu's "Zhenzhunang" and Li Gao's "Yao Lei Fa Xiang" and "Yong Yao Xin Fa," the analysis of the medicinal properties such as yin-yang, ascending, descending, floating and sinking, and the roles of sovereign, minister, assistant, and guide is quite profound.