188 KAIMING CHIU

#+ fT (1240 AD) he was retu (present I-ch'un ilsien in Kiangsi Province), which was his home. Again according to Sung Shih* At 217, Genealogical Table No. 8, Genealogy of the Imperial Household No. 3, 4 Chao llsi-ku was a descend-ant in the ninth generation of Prince Te-chao of Yen AFESM, a second son of the founder of the Sung dynasty. From these two records it is possible to establish that the date of Chao Hlsi-ku would probably fall between 1200-1280. Therefore it is clear that he could not have derived his information from any book supposed to be written when the YUan dynasty was well under way.

This mistake of Laufer's was due to (1) his failure to establish the date of Chao llsi-ku and (2) his misreading of the passage in the K'ang-hsi Dictionary H where three books are cited under the term ai-tai it. These books are (1) Cheng Tzit T'ung 1E+ f, the great