Another kind of cart which is used in the North to carry merchandise, and also for passengers, is much stronger than the cab, but, like it, is mounted on two wheels. The frame is of wood, and there is generally a cover of matting to keep off the heat of the sun. This cover is supported on posts that rise from the sides of the cart; but while useful against the sun, it is of no consequence in a storm, owing to its facility for letting the water run through. The teams for propelling these carts are more curious than the vehicles themselves, as they are indifferently made up of whatever animals are at hand. Oxen, cows, horses, mules, donkeys, and sometimes goats and dogs, are the beasts of burden that were seen by the boys in their rambles in Pekin and its vicinity, and on one occasion Fred saw a team which contained a camel harnessed with a mule and a cow. Camels come to Pekin from the Desert of Gobi, where great numbers of them are used in the overland trade between China and Russia. They are quite similar to the Arabian camel, but are smaller, and their hair is thicker, to enable them to endure the severe cold of the northern winter. In the season when tea is ready for export, thousands of camels are employed in transporting the fragrant herb to the Russian frontier, and the roads to the northward from Pekin are blocked with them. [Illustration: A COMPOSITE TEAM.] Walking was not altogether a pleasant amusement for our friends, as the streets were a mass of dust, owing to the carelessness of the authorities about allowing the refuse to accumulate in them. There is a tradition that one of the emperors, in a period that is lost in the mazes of antiquity, attempted to sweep the streets in order to make himself popular with the people; but he found the task too large, and, moreover, he had serious doubts about its being accomplished in his lifetime. So he gave it up, as he did not care to do something that would go more to the credit of his successor than of himself, and no one has had the courage to try it since that time. The amount of dirt that accumulates in a Chinese city would breed a pestilence in any other part of the world. Not only do the Chinese appear uninjured by it, but there are some who assert that it is a necessity of their existence, and they would lose their health if compelled to live in an atmosphere of cleanliness.