The tumor, however, having been produced, may in time subside, should the injury which provoked it not be repeated. Too often, however, the cause springs from motives over which the animal has no control; and the violence being renewed again and again, the swelling enlarges, and that which was soft and pulpy at first becomes hard to the feel, while all sensation of fluid disappears. The provocative being repeated, the part first grows firm, then solid, while its bulk also enlarges to a fearful magnitude. There appears to be no limit to the size; but the largest the author has encountered was nineteen inches in its greatest circumference, and seriously interfered with progression. Above, on the right hand, is a portrait of the tumor. These unsightly growths have two causes--the ignorance of the groom and the timidity of the animal. To speak of the last first: Dogs will dream; often, as they lie before the fire, they work their legs and utter suppressed noises, being at the time soundly asleep. Dogs also have imagination. Almost everybody must have remarked the dog slink away from some object which is to be indistinctly seen in the dusk of evening. Nobody, however, seems to have credited the horse with either of these faculties. Because it is of service to man, it is appropriated, and the attributes belonging to the creature are overlooked; the groom locks the stable door, and, having bedded the horses down, leaves them in the dark, "comfortable" for the night. One dreams--awakens in terror, similar to that which causes children to start out of their sleep with terrible crying. The hind legs are the means of defense with the horse; it has no other, for it seldom, and not habitually, employs its teeth. The animal, in alarm, begins kicking, for terror becomes powerful as the reason diminishes. Animals have passions; these man can, in himself, subdue with reason; but the poor horse has no reason to restrain its emotions. Fear, once awakened, unopposed, possesses it; it begins to kick before it knows why. Bodies of men are exposed to panics. Can we wonder, therefore, at a timid and unreasoning animal being subject to the same influences? The kicking commenced, terror spreads; and a whole stable full of horses, each chained to its stall, each alone, forbidden the consolation of society, and prevented from scampering from the unknown horror, takes up the action; thus thirty or forty horses may be heard, in the depth and darkness of a night, kicking at the same time. The hind legs, when forcibly projected, are apt to hit the point of the hock; the bursa there developed is injured by the blow, and a capped limb is the consequence.