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 the forward impulse of his legs. But if the legs produce a greater impulse than the hand can receive, the center of gravity will pass to the fore hand. Contrawise, if the hand produces a greater effect than the legs can overcome, the center of gravity will shift to the hind legs, and the forward impulse will be lost. In either case there is lack of accord. Again, suppose that the rider wishes to carry his horse forward at a walk. If thereupon the legs produce so powerful an effect that the hand cannot receive it, the horse will take the trot. Legs and hand, rider and horse, are not in accord.

Not only, however, must the rider's effects be in accord with one another in order to obtain the gait or the movement asked, they must, in addition, be in accord with the nature and energy of the horse. The rider, therefore, to obtain any particular movement, has to ask that particular movement by adjusting accurately his effects to that movement, not to some other. Otherwise, horse and man are not in accord, because the man's effects do not match his special demand.

T HE center of gravity of any body is that point upon which the body will balance in all positions. The balance of our own bodies upon the legs, which support the weight and prevent it from falling to the ground at each step, is so familiar and instinctive that we fail to appreciate it or to reflect