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THREE:In due time they entered the waters of the great river of Northern China, the Yang-tse. They entered them long before they sighted land, as the vast quantities of earth brought down by the stream make a change in the color of the sea that can be readily distinguished a great distance from the coast. In this respect the Yang-tse is similar to the Mississippi, and the effect of the former on the Yellow Sea is like that of the latter on the Gulf of Mexico. The coast at the mouth of the Yang-tse is low and flat, and a ship is fairly in the entrance of the river before land can be seen. The bar can be passed by deep-draught vessels only at high water, and consequently it often becomes necessary for them to wait several hours for the favorable moment. This was the case with our friends, and they walked the deck with impatience during the delay. But at last all was ready, and they steamed onward in triumph, dropping their tow at Woosung, and waving a good-bye to "the Mystery," who had recognized them from the deck of the disabled bark.