Zhang Zhongjing. Small Enthalpy refers to the disciple of Zhang Zhongjing, a famous Taoist, medical scientist and cultural celebrity in ancient China. Zhang Zhongjing was a figure from the late Eastern Han Dynasty to the Three Kingdoms period, and was honored as a medical sage. His book Treatise on Febrile Diseases is regarded as one of the classics of traditional Chinese medicine, which has a far-reaching impact on the development and academic research of traditional Chinese medicine.