First edition in English of the Yellow Emperor's Inner Classic (Huangdi Neijing,) , the most important ancient text in Chinese medicine as well as a major book of Daoist theory and lifestyle. According to leading scholars it was written between the late Warring States period (475-221 BCE) and the early Han period (206 BCE–220 CE).The text is structured as a dialogue between the Yellow Emperor and one of his ministers or physicians, most commonly Qíbó, but also Shàoyú.