To facilitate this exercise also, it may be advisable in some cases to take the whole school instead of half of it; but in that case the horse should go over the same ground in the "half passage" at a walk, as he afterwards does at a canter.
When the exercise is done at the latter pace, no attempt should be made at the first effort to change the horse at the boards. The master should give the word very quietly directly the pupil turns the corner of the school, and she should then press her horse well up, and turn his head smoothly from the centre marker, applying her aids with firmness and decision, endeavouring at the same time to prevent him from hurrying his pace. This, however, at the first attempt, it is scarcely to be expected that she will accomplish.
If the whole school is taken, the point of arrival at the boards should be about a horse's length from the end, where he should be brought quietly to a walk, the rider for this purpose keeping the body back, turning the little fingers of both hands up towards the waist, and drawing the hands themselves well towards her waist. The bend of the horse's head should then be changed to the left, by allowing the off side reins to slip through the right hand about two inches, and drawing the near-side reins through the left hand, with the right, to an equal extent. The near-side reins should then be passed into the right hand, while with the left the rider "makes much" of her horse on the near side. This, of course, should only be done if he has executed the movement with reasonable precision, for (to repeat) perfection cannot be expected in the pupil's first effort.
Plenty of time should be taken between these "half-passage" lessons, because they are severe, calling very much upon the physical powers of both horse and rider.
In order to give both a fair chance, the lesson should be again done at a walk, then at a canter, the pupil carefully instructed on arriving at the boards to strike the horse off collectedly to the left. To do this she should quietly change the bend to that hand, carry her left foot well forward towards the horse's shoulder, so as to use an action of her leg reverse to that she had recourse to in striking him off to the right. She should keep him well bent, but well supported with the outward rein. When she has him in the corner of the school, and bent both in his neck and ribs (which in turning and putting his off fore foot into the angle must be the case, if she applies her whip smartly behind the flap of the saddle, and presses her left foot to his near elbow, keeping his forehand well up at the same time), he can scarcely refuse to strike off with his near leg; but it must be borne in mind that a lady cannot be expected to execute this movement with any certainty unless the horse has been previously taught by a man to obey the aids the lady applies as above directed. This, however, every breaker who knows his business can easily do.
When a fair amount of proficiency is acquired in this lesson, the change may be made from what is technically called a "half halt," which means simply that, the horse being thrown more upon his haunches, the aids are applied with great firmness, and the horse compelled to change his leg without being brought completely to the walk. The degree of proficiency, however, should be when the pupil can change her horse with certainty after halting him.
The pace at which the half passage is done should be very collected, and, I repeat, if the rider and horse do it only reasonably well (that is, the latter continuing true and united in his pace, and changing freely after being halted), that for some little time it should be considered sufficient, and every allowance made for the fact that the lady, unlike the male rider, cannot give support to her horse with both legs.
Most likely at first the horse will throw his haunches out a little, and the rider slightly lose her position. Practice and the close application most ladies give to riding will suffice to correct all this, and in due time the pupil will be able to execute the lesson with smoothness and ease to herself and her horse. She will then be sufficiently advanced to commence cantering on the curb rein alone. This, as regards finish in the rider's hand, is in equitation what tone is in music. Every motion of the little finger, or the slightest turn of the wrist, acts upon the curb when it is unrelieved by the snaffle with so much more power, that the greatest care is necessary to keep the bridle hand steady at first, and to avoid anything approaching to suddenness or roughness of action.
This steadiness is best accomplished by causing the pupil to ride with the reins arranged military fashion, with the snaffle reins hanging over the full of the left hand, the off side rein uppermost, and the right hand holding the end of the curb reins, as before described, which affords greater facility for easing and feeling them than can at first be expected, when the action is given altogether from the left wrist. In the latter case, the hand without considerable practice would be far too heavy, even when the arm was kept quite firm, and unbearably heavy to the horse if there was any motion from the shoulder of the rider.
I must repeat that the lines of action of the little finger of the bridle hand are four—namely, towards the right and left shoulder respectively, according as the rider desires to turn the horse right or left; and towards his neck and her own waist, as she wishes to collect, rein back, or move him forward.