his interpretations, but much less judicious than Mei Yao-ch’en, and on the whole not a very trustworthy guide. He is fond of comparing his own commentary with that of Ts’ao Kung, but the comparison is not often flattering to him. We learn from Ch’ao Kung-wu that Wang Hsi revised the ancient text of Sun Tzŭ, filling up lacunae and correcting mistakes. [45]