When he is being rubbed down and teased with flies he is bound to use his
						hoofs in the same way as when he walks. The frogs also are hardened by
						stones scattered in this way. The same care must be taken to make his mouth
						tender as to harden his hoofs. This is done by the same methods as are
						employed to soften human flesh. It is a mark of a good horseman, in our
						opinion, to see that his groom, like himself, is instructed in the way in
						which he should treat the horse. First then the man ought to know that he
						should never make the knot in the halter at the point where the headstall is
						put on. For if the halter is not easy about the ears, the horse will often
						rub his head against the manger and may often get sores in consequence. Now
						if there are sore places thereabouts the horse is bound to be restive both
						when he is bridled and when he is rubbed down.