If he takes the bit, of course the bridle should be put on. But if he refuses
						to open his mouth, the man must hold the bit to his teeth and put the thumb
						of the left hand in the horse’s jaw. Most horses open the mouth when this is
						done. If he still resists, the man should squeeze his lip against the tusk;
						and very few resist when they are treated in this way. The groom should also be instructed in the following points: first, never to
						lead the horse on the rein—that gives the horse a hard mouth on one side—and
						secondly, what is the correct distance from the bit to the jaws. For if it
						is too high up, it hardens the mouth so that it loses its sensitiveness; and
						if it lies too low in the mouth, it gives the horse power to take it between
						his teeth and refuse to obey.