It is not sufficient for the Horse to cross his Legs only one over the other, he must go forward likewise at the same time, because in making the Change large, his Feet should describe two diagonal Lines.—It is of Importance therefore, that the same Attention be had to the inner as the outward Leg, for it is by the means of his Legs only that he can advance. It is true that you should endeavour to make him go forward by putting back your Body, and yielding your Hand; but if he won't obey these Aids, you must make use of the Calfs of your Legs, aiding more strongly with your Left-leg when you are going to the Right-hand, and more strongly with your Right-leg when you are going to the Left. Besides, it is so necessary to have an equal Attention to the Legs, because the Horse could never work with Justness, if he were not ballanced equally between the Rider's Legs; and it is from this exact Obedience only, that he is enabled to make the Changes with Precision, because without a Knowledge of the Hand and Heels, it is impossible he should obey the Motions of his Rider—In order to close the Change justly, the Horses Fore-legs should arrive at the same time upon a strait Line; so that a Change justly executed, and in the same Cadence or Time, is such, as is not only begun, but finish'd likewise, and closed in such a Proportion, that the Croupe always accompanies and keeps Pace with the Shoulders throughout.—In order to finish it in this manner, you must observe the following Rules. The greater Number of Horses, instead of finishing their Changes with Exactness, are apt to lean on one Side, to make their Croupe go before their Shoulders, and to throw themselves with Impatience, in order to get upon one Line again; the Method of correcting them for these Irregularities, is to make a Demi-volte of two Lines, in the same Place where they were to have closed their Change; for Example, if in changing to the Right, they are too eager to come upon the strait Line, without having properly finish'd their Change, demand of them a Demi-volte to the Left, which you must make them round equally with their Shoulders and Haunches.
An essential Point, which nevertheless is little regarded, is the making your Horse resume his Line, or go off again to the other Hand, when he has made his Change. To make him do this, you must carry your Hand to the Side to which you have closed your Change, and carry it insensibly as it were, after which you will be able with great Ease to bend your Horse to the Inside. I must further explain the Necessity of this Action.
It is evident that a Horse in the Passage, neither can, nor ought if he could, move the two Feet on the same Side together. In beginning and finishing the Change, the outward Leg and Shoulder pass and cross over the inner Leg and Shoulder; he is consequently supported in this Action on the outward Haunch, for the inner Foot behind was off the Ground; now, if at the Closing of the Change, and in the Instant that he is again upon one Line; as for Example—If in closing his Change to the Right, the Horse is supported in this Action by the left Haunch, how is it possible that he can be bent to the Left? To attempt this, would be to make him move two Legs on the same Side, which would be undertaking a thing impossible to be done. Being therefore arrived upon one Line, carry your Hand to the Wall, this will make your Horse change his Leg; he will be supported in his Action by his right Haunch, and will be able to bend himself with great Facility.
In order to make the Volte true and perfect, he ought to be just with respect to his Head and Neck, and have the Action of his Shoulders and Haunches quite equal. When I say that a Horse should have his Shoulders and Haunches equal, I would not be understood to mean, that his Fore-feet should not cover more Ground than his Hinder; on the contrary, I know it is a Rule never to be departed from, that his Shoulders should precede half of the Haunches; but I insist that the Haunches should go along with, and follow exactly the Motion of, the Shoulders; for 'tis from their Agreement, and from the Harmony between the Hind-legs and the Fore, upon which the Truth of the Volte depends. The four Legs of a Horse may be compared to the four Strings of an Instrument; if these four Cords don't correspond, it is impossible there should be any Musick; it is the same with a Horse, if the Motions of his Haunches and Fore-legs don't act together and assist each other, and if he has not acquired a Habit and Ease to perform what he ought to do, the most expert and dextrous Horseman will never be able to acquit himself as he ought, nor execute any Air justly and with Pleasure, be it either on the Volte or strait forward.
Whenever you put your Horse to the Passage upon the Voltes, he ought to make the same Number of Steps or Times with his Hinder, as with his Fore-feet; if the Space of the Ground upon which he works is narrow and confin'd, his Steps should be shorter.
I will suppose that he describes a large Circle with his Fore-feet; the Action of his outward Shoulder ought consequently to be free, and the Shoulder much advanced, in order to make the outward Leg pass over and cross at every Step the inner Leg, that he may more easily embrace his Volte, without quitting the Line of the Circle, and without disordering his Hinder-leg; which ought likewise to be subject to the same Laws as the Fore-legs, and cross the outward Leg over the inner, but not so much as the Fore-legs, because they have less Ground to go over, and should only keep the Proportion.—In working upon Voltes of two Lines, the Horse should make as many Steps with his Hinder as with his Fore-feet; because those Horses whose Haunches go before the Shoulders, and who cut and shorten the exact Line of the Volte, are apt to keep their Hinder-feet in one Place, and make at the same time one or two Steps with their Fore-feet, and by this means falsify and avoid filling up the Circle in the Proportion they begun it. The same Fault is to be found with Horses who hang back at the End of a Change, and throwing out their Croupe, arrive at the Wall with their Shoulders, and consequently fail to close their Change justly.
Further, in working upon this Lesson, it is indispensably necessary that at every Step the Horse takes, he should make his outward Leg cross and come over the inner, because this will prevent a Horse that is too quick of Feeling, or one, that is ramingue, from becoming entier, or to bend himself, or lean in his Voltes, Vices that are occasion'd from having the Haunches or Hinder-legs too much constrain'd. There are Horses likewise who have their Croupe so light and uncertain, that from the Moment they have begun the Volte, they lean and widen their Hinder-legs, and throw them out of the Volte.
To remedy this, aid with the outward Leg, carrying your Bridle-hand to the same Side, and not in, because it is by the Means of the outward Leg and inner Rein, that you will be enabled to adjust and bring in the Croupe upon the Line which it ought to keep.
If it happens that the Horse don't keep up to the Line of his Volte, or throws his Croupe out, press him forward, letting him go strait on two or three Steps, keeping him firm in the Hand, and in a slow and just Time, and use the Aids which I have just now directed.—This Lesson is equally useful in case your Horse is naturally inclin'd to carry his Haunches too much in, and where he is ramingue, or in danger of becoming so; but then the Aids must be given on the Side to which he leans, and presses, in order to widen his Hinder-parts, and to push the Croupe out.
Above all you should remember, that whatever tends to bend or turn the Head on one side, will always drive the Croupe on the other; when the Horse's Croupe don't follow his Shoulders equally, the Fault may proceed either from a Disobedience to the Hand, or from his not answering the Heels as he ought. If you would remedy this, keep him low before; that is to say, keep your Bridle-hand very low, and while you make him advance upon two Treads, aid him firmly with the Calfs of the Legs; for as the outward Leg will confine and keep his Croupe in, the inner Leg, operating with the outward, will make him go forward.