In a well-known collection of ritual notes, the Ta Tai Li (The Rites of the Elder Tai), considered to be earlier than the Han period (206 B.C.), there is a calendar section (No. 47), termed Hsia Hsiao Chêng (The Lesser Canon of the Hsia), which is traditionally regarded as a true relic of the Hsia dynasty (about 2000 B.C.). It was translated by DouglasR. K.Professor (Orientalia Antiqua, 1882) and was regarded by him and some other students as of great antiquity. On the other hand, it is very difficult to understand, in the light of modern discoveries as to the Shang culture (circa 1200 B.C.), how such a document could have been produced in 2000 B.C., and the more conservative students are unwilling to admit that it can be much older than, say, 500 B.C.