王皙 Wang Hsi , also of the Sung dynasty, is decidedly original in some of his interpretations, but much less judicious than Mei Yao-chʽên , and on the whole not a very trustworthy guide. He is fond of comparing his own commentary with that of Tsʽao Kung , but the comparison is not often flattering to him. We learn from Chʽao Kung-wu that Wang Hsi revised the ancient text of Sun Tzǔ , filling up lacunae and correcting mistakes. 110