"In this delectable laver he throws himself flat upon his side, and forcing himself violently around, with his horns and his huge hump on his shoulders presented to the sides, he ploughs up the ground by his rotary motion, sinking himself deeper and deeper in the ground, continually enlarging his pool, in which he at length becomes nearly immersed, and the water and mud about him mixed into a complete mortar, which changes his color and drips in streams from every part of him as he rises up upon his feet, a hideous monster of mud and ugliness, too frightful and too eccentric to be described! "It is generally the leader of the herd that takes upon him to make this excavation, and if not (but another one opens the ground), the leader (who is conqueror) marches forward, and driving the other from it plunges himself into it; and, having cooled his sides and changed his color to a walking mass of mud and mortar, he stands in the pool until inclination induces him to step out and give place to the next in command who stands ready, and another, and another, who advance forward in their turns to enjoy the luxury of the wallow, until the whole band (sometimes a hundred or more) will pass through it in turn,[37] each one throwing his body around in a similar manner and each one adding a little to the dimensions of the pool, while he carries away in his hair an equal share of the clay, which dries to a gray or whitish color and gradually falls off. By this operation, which is done perhaps in the space of half an hour, a circular excavation of fifteen or twenty feet in diameter and two feet in depth is completed and left for the water to run into, which soon fills it to the level of the ground. [Note 37: In the District of Columbia work-house we have a counterpart of this in the public bath-tub, wherein forty prisoners were seen by a _Star_ reporter to bathe one after another in the same water!] "To these sinks, the waters lying on the surface of the prairies are continually draining and in them lodging their vegetable deposits, which after a lapse of years fill them up to the surface with a rich soil, which throws up an unusual growth of grass and herbage, forming conspicuous circles, which arrest the eye of the traveler and are calculated to excite his surprise for ages to come."