Mei Yao-ch‘ên asks, with some plausibility, whether 帝 is not a mistake for 軍 “armies,” as nothing is known of Huang Ti having conquered four other Emperors. The _Shih Chi_ (ch. I _ad init._) speaks only of his victories over 炎帝 Yen Ti and 蚩尤 Ch‘ih Yu. In the 六韜 it is mentioned that he “fought seventy battles and pacified the Empire.” Ts‘ao Kung’s explanation is, that the Yellow Emperor was the first to institute the feudal system of vassal princes, each of whom (to the number of four) originally bore the title of Emperor. Li Ch‘üan tells us that the art of war originated under Huang Ti, who received it from his Minister 風后 Fêng Hou. 11. 凡軍喜高而惡下貴陽而賤陰 All armies prefer high ground to low, “High ground,” says Mei Yao-ch‘ên, “is not only more agreeable and salubrious, but more convenient from a military point of view; low ground is not only damp and unhealthy, but also disadvantageous for fighting.” The original text and the _T‘u Shu_ have 好 instead of 喜. and sunny places to dark. 12. 養生而處實軍無百疾是謂必勝 If you are careful of your men, Ts‘ao Kung says: 向水草可放牧養畜 “Make for fresh water and pasture, where you can turn out your animals to graze.” And the other commentators follow him, apparently taking 生 as = 牲. Cf. Mencius, V. 1. ix. 1, where 養牲者 means a cattle-keeper. But here 養生 surely has reference to the health of the troops. It is the title of Chuang Tzŭ’s third chapter, where it denotes moral rather than physical well-being. and camp on hard ground, 實 must mean dry and solid, as opposed to damp and marshy, ground. This is to be found as a rule in high places, so the commentators explain 實 as practically equivalent to 高. the army will be free from disease of every kind, Chang Yü says: “The dryness of the climate will prevent the outbreak of illness.” and this will spell victory. 13. 邱陵隄防必處其陽而右背之此兵之利地之助也 When you come to a hill or a bank, occupy the sunny side, with the slope on your right rear. Thus you will at once act for the benefit of your soldiers and utilise the natural advantages of the ground. 14. 上雨水沫至欲涉者待其定也 When, in consequence of heavy rains up-country, a river which you wish to ford is swollen and flecked with foam, you must wait until it subsides. The _T‘ung Tien_ and _Yü Lan_ have a superfluous 下 before 水. 15. 凡地有絶澗天井天牢天羅天陷天隙必亟去之勿近也 Country in which there are precipitous cliffs with torrents running between, 絶澗, explained by Mei Yao-ch‘ên as 前後險峻水橫其中. deep natural hollows, 天井, explained as 四面峻坂澗壑所歸 “places enclosed on every side by steep banks, with pools of water at the bottom.” confined places, 天牢 “natural pens or prisons,” explained as 三面環絶易入難出 “places surrounded by precipices on three sides—easy to get into, but hard to get out of.” tangled thickets, 天羅, explained as 草木蒙密鋒鏑莫施 “places covered with such dense undergrowth that spears cannot be used.” quagmires