If you find that your Horse disobeys the Heel, and throws his Croupe out in spite of that Aid, in this Case make use of your inner Rein, carrying your Hand out with your Nails turned upwards; this will infallibly operate upon the Croupe, and restrain it. Use the same Remedy, if in the Passage your Horse carries his Head out of the Volte, and you will bring it in; but you must remember, in both Cases, to replace your Hand immediately after having carried it out, in order to make the outward Rein work, which will facilitate and enable the outward Legs to cross over the inner.
If the Horse breaks the Line, and flings his Croupe upon the Right-heel, work him to that Side with your Left; if he would go sideways to the Left, make him go to the Right; if he flings his Croupe out, put it quietly in; in short, if all at once he brings it in, put it quietly out; and, in a word, teach him by the Practice of good Lessons to acquire a Facility and Habit of executing whatever you demand of him.
The Consequence of all the different Rules and Principles, which I have here laid down, and which may be applied equally to the Changes, large and narrow, to Changes upon the Voltes, and Half-voltes; the Consequence of these Instructions I say will be, if practised judiciously, a most implicit and exact Obedience on the Part of the Horse, who from that Moment, will resign his own Will and Inclination, and make it subservient to that of the Rider, which he must teach him to know by making him acquainted with the Hand and Heel.
CHAP. XIII.
Of the Aids of the Body.
The Perfection of all the Aids consists, as I have already proved, in their mutual Harmony and Correspondence, for without this Agreement, they must be always ineffectual; because the Horse can never work with Exactness and Delicacy, and keep the Proportion and Measure which is inseparable to all Airs, when justly and beautifully executed.
This Maxim being laid down, we shall undertake to demonstrate, that the Aids of the Body contribute, and are even capable of themselves, from the Principles of Geometry, to make us acquire the Union of the Aids of the Hand and Leg; and if so, we shall be obliged to own the Conclusion, that they are to be prefer'd to all the rest.
The Justness of the Aids of the Body depends upon the Seat of the Horseman.—Till he is arrived at the Point of being able to sit down close and firm in his Saddle, so as to be immoveable in it, it would be vain to expect he should be able to manage a Horse; because, besides that he would be incapable of feeling his Motions, he would not be possessed of that Equilibre and Firmness of Seat, which is the Characteristic of a Horseman. I would define the Equilibre to be, when the Horseman sits upon his Twist, directly down and close upon the Saddle, and so firm that nothing can loosen or disturb his Seat; and by Firmness, I express that Grasp or Hold with which he keeps himself on the Horse, without employing any Strength, but trusting entirely to his Ballance, to humour and accompany all the Motions of the Horse.
Nothing but Exercise and Practice can give this Equilibre, and consequently this Hold upon the Horse. In the Beginning, the Fear which almost every Scholar feels, and the Constraint which all his Limbs are under, make him apt to press the Saddle very close with his Thighs and Knees, as he imagines he shall by this Method acquire a firmer Seat; but the very Efforts that he makes to resist the Motions of the Horse, stiffen his Body, and lift him out of the Saddle, so that any rude Motion, or unexpected Shock, would be likely to unhorse him; for from the Moment that he ceases to sit down and quite close to the Saddle, every sudden Jirk and Motion of the Horse attacking him under his Twist, must shove him out of the Saddle.
We will suppose then a Person, the Position of whose Body is just and regular, and who, by being able to sit down perpendicular and full in his Saddle, can feel and unite himself to his Horse so as to accompany all his Motions; let us see then how this Person, from the Motions of his own Body, will be able to accord and unite the Aids or Times of the Hands and Legs.