There are those who assert roaring is no injury to the powers of a horse. Certain animals, to be sure, can hunt and keep a good pace, although thus afflicted; but Nimrod (as the well-known, late sporting writer called himself) soon found out to his cost that all roarers were not fit to ride across country. The writer has seen a sailor, deprived of one leg, dance a hornpipe with wonderful agility; but it would be folly, therefore, to say sailors were not injured as dancers by the loss of a limb. That which impedes the free passage of air to the lungs must be a rather serious detriment to exertion. The cab proprietors of London, who cannot afford to purchase very sound animals, and then to let them out at so much per day to strange drivers, have discovered a way to prevent the noise generally made by roarers. This end is attained by placing a pad under a portion of the harness. In the following engraving this pad is indicated by a white mark; though in reality it is so colored as to blend with the coat of the horse. It presses upon the nostrils near to their openings, and by thus limiting the extent of their expansion, by controlling the space through which the air has to pass, it also commands the quantity of atmosphere which is inspired. Thus the bulk of air is regulated to the diminution of the respiratory organs. The horse breathes freer, and no noise is made during the act. Yet, although such a contrivance may do very well for a London cab, the pace of which is regulated by Act of Parliament, it evidently is unsuited to the field, where everything depends on the capacity of the lungs, and nothing upon the sound made during inspiration. Other causes are mentioned by different writers as provocatives of roaring, besides tight reining. Some of these, like thickening and ulceration of the membrane lining the larynx, are the after consequences of acute disease, and, as such, are to be prevented only by judicious treatment during the existence of the primary disorder. Among other causes, bands of coagulable lymph in the trachea, and congenital deformity, are too rare to deserve the attention they have received. There is one consolation, however, connected with the subject which breeders may accept with confidence. Roaring is not necessarily hereditary. There is, moreover, a caution, which, associated with roaring, may be given to purchasers. When trying a horse at the top of its speed, never hold in the reins tightly. By so doing, you draw the head upon the neck, compress the larynx, and may make almost any animal, however sound, "roar like a bull." Rather wait till the animal has stopped. Then dismount, place your ear against the windpipe, and, if the horse is a roarer, the deep inspirations necessary to tranquilize the system will inform you plainly enough of the fact. CHOKING.