Synopsis of Prescriptions of the Golden Chamber (Jin Gui Yao Lue) and Treatise on Febile Diseases Caused by Cold (Shang Han Lun) are the two most important classics of traditional Chinese medicine, written early in the third century by Zhang Zhongjing, the great sage of traditional Chinese medicine. The importance of these two books in traditional Chinese medicine is similar to that of Newtonian theory in the world of physics and Euclid's Elements in the field of geometry. These two books are still used by students as textbooks in all colleges of traditional Chinese medicine, as well as being used by medical practitioners and scholars in the field as reference books. The above-mentioned books were originally known as one book called Treatise on Febile Diseases Caused by Cold and Miscellaneous Diseases (Shang Han Za Bing Lun). It got scattered and lost in the years that followed, but collected and compiled by medical practitioners and scholars of later generations. The part of the book dealing with diseases caused by cold was named Treatise on Febile Diseases Caused by Cold and the part on miscellaneous diseases of internal medicine re-named Synopsis of Prescriptions of the Golden Chamber.