CHAPTER XXI
PUBLIC WORKS
Engineering works of old Emperors—Marvellous chiselled gorge above Tch'ang—Pa and Shuh kingdoms (= Sz Ch'wan)—The engineer Li Ping in Sz Ch'wan: his sluices still in working order after 2200 years of use—Chinese ideas about the sources of the Yang-tsz—The Lolo country and its independence—The Yellow River and its vagaries—Substitution of the Chou dynasty for the Shang dynasty— First rulers of Wu make a canal—Origin of the Grand Canal— Explanation of the old riverine system of Shan Tung—Extension of the Canal by the First August Emperor—Kublai Khan's share in it— The old Wu capital—Soochow and its ancient arsenals—No bridges in old clays: fords used—Instances—Limited navigability of northern rivers—Various Great Walls—Enormous waste of human life—New Ts'in metropolis—Forced labour and eunuchs.