In 1987, wooden slips named Zhi Chigu Fang (Chigu Decoction) were discovered on the site of the Ancient People's Dike in Zhangjiajie, Hunan Province. 15 drugs with dosage were listed on the front of the wooden slip and processing on the reverse side. Though there are two academic opinions about Chigu Decoction neither of them is convincing. Zhi means treatment and Chigu is the name of an ancient exogenous febrile disease with the symptoms of aversion to cold, fever, headache and neck pain, ankylosis, cough and asthma or cold pain in the gastric area and diarrhea. Chi is a descriptive word describing the appearance of exogenous febrile fever.