In other words, with a well-conformed horse, the state of equilibrium is very easy for a practiced rider and very difficult for a novice. With a badly conformed horse, the desired state is difficult for the experienced esquire, and very nearly impossible for the inexperienced, even if they both employ both hands and legs.
It comes about, then, that, whether the horse be well or ill conformed, it has to be trained to the condition of equilibrium by means of both hands and legs. But the horse once trained, though not before, it becomes possible to preserve the state of equilibrium by means of the rider's legs without the cooperation of his hands, or by means of his hands without the cooperation of his legs.
But now arises the question, how does accuracy of seat act upon the center of gravity, which is the immediate sequence of the state of equilibrium? The answer is, that this equilibrium is a unit, and the center of gravity is an element. We obtain this unified condition by the accord of our effects of hands and of legs. But if, when we have obtained this unit condition, we employ more effect of hands or more effect of legs in order to execute a movement, we at once disturb the original unity. Thereupon the equilibrium vacillates between the hands and the legs, and does not remain permanently anywhere.
On the other hand, by means of accuracy of seat, we are able to act upon this unified condition of
