The distance between the Yellow and Yangtsz’ rivers is about ninety miles, and the canal here is carried largely upon a raised work of earth, kept together by retaining walls of stone, and not less than twenty feet above the surrounding country in some parts. This sheet of water is about two hundred feet wide, and its current nearly three miles an hour. South of the Hwang ho several large towns stand near the levees, below their level, whose safety wholly depends upon the care taken of the banks of the canal. Hwai-ngan and Pauying lie thus under and near them, in such a position as to cause an involuntary shudder at the thought of the destruction which would take place if they should give way. The level descends from these towns to the Yangtsz’, and at Yangchau the canal is much below the houses on its sides. It also connects with every stream or lake whose waters can be led into it. There are two or three inlets into the Yangtsz’ where the canal reaches the northern bank, but Chinkiang, on the southern shore, is regarded as the principal defence and post of its crossing. The canal leaves the river east of that city, proceeds south-east to Suchau, and thence southerly on the eastern side of lake Tai, with which it communicates, to Hangchau in Chehkiang. This portion is by far the most interesting and picturesque of the whole line, owing to its rich and populous cities, the fertility and high cultivation of the banks, and the lively aspect imparted by the multitude of boats. Though Kublai has had the credit of this useful work, it existed in parts of its course long before his day. The reach between the two great rivers was opened in the Han dynasty, and repaired by the wise founder of the Sui dynasty (A.D. 600). The princes of the Tang dynasty kept it open, and when the Sung emperors lived at Hangchau they made the extension up to Chinkiang the great highway which it is to this day. The work from Peking to the Yellow River was opened by the Mongols about 1289, in which they merely joined the rivers and lakes to each other as they now exist. The Ming and Tsing emperors have done all they could to keep it open throughout, and lately an attempt has been made to reopen the passage from Hungtsih Lake north into the old bed, so that boats can reach Tientsin from Kwachau. Its entire length is about 650 miles, or not quite twice that of the Erie Canal, but it varies in its breadth and depth more than any important canal either of America or Europe.