We studied the phrases and the sentences of Dong-Eui Bo Kahm (東醫寶鑑) that were quoted from the So Moon (素問) and the Young Chu (靈樞). Mainly most of quoted sentences were same with original texts. The principal contents of this study can be summarized as follows. First, there are a few cases that the phrases of Dong-Eui Bo Kahm become more distinct and minute than that of the So Moon and the Young Chu. Second, there are many cases that the phrases of Dong-Eui Bo Kahm become briefer than that of the So Moon and the Young Chu. Third. many synonyms and equivalents of the phrases of the So Moon and the Young Chu were used in Dong-Eui Bo Kahm. Forth, there are a few wrong words and incorrect phrases in Dong-Eui Bo Kahm. Fifth, there are many omissed words and added words in Dong-Eui Bo Kahm. But that quoted sentences have same meaning with original sentenses. Sixth, original text book names were recorded in the end of all sentenses of Dong-Eui Bo Kahm, but there were a few wrong text book names.

Yin and Yang are a general idea to understand phenomenon and human body. Specially in medicine, the principle of Yin and Yang is clinical and positive. As the principle of Yin and Yang, the human body can be seperated two parts; male-female, upward-downward, front-rear, left-right, interior-exterior, inside-outside and heat-cold, input-output, contraction-relaxation, hard-soft, active-pasive, weekness-strong and old-young, white-black, fat-lean, high-low, long-short, spirit-body. But, Yin and Yang are facing and interchanging each other. Summaries of a study on the means of yin and yang in Naekyoung and Waekyung chapter of DongEuiBoKahm are as follows. 1. Yin and Yang represent Objects . They represent natural phenomena; for example the situation of weather and time is expressed by them. . They represent urinary organ, anus, genital organ. . They represent the five viscera and the six entrails and their functions. . They represent male and female. . They represent fat and lean. 2. Activity and Inactivity are represented by Yin and Yang. ；They mean increasing of temperature by activity and decreasing of temperature by inactivity. . They mean the movement and activity of Ki 3. Yin expresses formation and Yang expresses functions. . Ki and it's functions are expressed by Yin and Yang. . Body fluid, blood and fundamental nutrition are expressed by Yin and Yang ；Organic system of human body and functions of organs are expressed by Yin and Yang. 4. The directions in human body and direction of Ki are expressed by Yin and Yang ；Inside and Outside of human body are expressed by Yin and Yang. . Emission and contraction is expressed by Yin and Yang. ․Upper and lower side of human body are separated by Yin and Yang. ․Upward and downward flow of Qi is expressed by Yin and Yang. . They represent KyungNak, YoungKi, WeKyung.a