Whilst all this was going on, Mencius, the Confucian philosopher, and the two celebrated diplomatists (of Taoist principles), Su Ts'in and Chang I, were flying to and fro all over orthodox China with a view of offering sage political advice; this was the time _par excellence_ when the rival Taoist and Confucian prophets were howling in the wilderness of war and greed: but Ts'in cared not much for talkers: generals did her practical business better: in 308 she began to cast covetous eyes on the Emperor's poor remaining appanage. In 301 she was called upon to quell a revolt in Shuh; then she materially reduced the pretensions of her great rival Ts'u; and finally rested a while, whilst gathering more strength for the supreme effort-the conquest of China. CHAPTER XXVII FOREIGN BLOOD The history of China may be for our present purposes accordingly summed up as follows. The pure Chinese race from time immemorial had been confined to the flat lands of the Yellow River, and its one tributary on the south, the River Loh, the Tartars possessing most of the left bank from the Desert to the sea. However, from the beginning of really historical times the Chinese had been in unmistakable part-possession of the valleys of the Yellow River's two great tributaries towards the west and north, the Wei (in Shen Si) and the Fen (in Shan Si). Little, if any, Chinese colonizing was done much before the Ts'in conquests in any other parts of Tartarland; none in Sz Ch'wan that we know of; little, if any, along the coasts, except perhaps from Ts'i and Lu (in Shan Tung), both of which states seem to have always been open to the sea, though many barbarian coast tribes still required gathering into the Chinese fold. The advance of Chinese civilization had been first down the Yellow River; then down the River Han towards the Middle Yang-tsz; and lastly, down the canals and the Hwai network of streams to the Shanghai coast. Old colonies of Chinese had, many centuries before the conquest of China by the Chou dynasty, evidently set out to subdue or to conciliate the southern tribes: these adventurous leaders had naturally taken Chinese ideas with them, but had usually found it easier for their _own_ safety and success to adopt barbarian customs in whole or in part. These mixed or semi-Chinese states of the navigable Yang-tsz Valley, from the Ich'ang gorges to the sea, had generally developed in isolation and obscurity, and only appeared in force as formidable competitors with orthodox Chinese when the imperial power began to collapse after 771 B.C. The isolation of half-Roman Britain for several centuries after the first Roman conquest, and the departure of the last Roman legions, may be fitly compared with the position of the half-Chinese states. Ts'u, Wu, and Yüeh all had pedigrees, more or less genuine, vying in antiquity with the pedigree of the imperial Chou family; and therefore they did not see why they also should not aspire to the overlordship when it