. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. PHYSIOLOGY OF MOVEMENT. 747 seldom still in the horse. It is characterized by the fact that the eleva- tion of the second leg on the same side occurs sooner than in the walk. The walk merges into the amble when, the body being supported by the two legs on the same side, the two opposite legs are elevated simul- taneously instead of separately, as in the walk (Fig. 308). In the walk the fore leg is always one-half the extent of its move- ment behind the hind leg on the same side, while in the amble both leg
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. PHYSIOLOGY OF MOVEMENT. 747 seldom still in the horse. It is characterized by the fact that the eleva- tion of the second leg on the same side occurs sooner than in the walk. The walk merges into the amble when, the body being supported by the two legs on the same side, the two opposite legs are elevated simul- taneously instead of separately, as in the walk (Fig. 308). In the walk the fore leg is always one-half the extent of its move- ment behind the hind leg on the same side, while in the amble both legs on one side move together, so that, therefore, there is a regular change between the feet on each side of the body. Consequently, in the amble the centre of gravity is first shifted to the one side and then to the other, the length of the step in the amble and walk being the same. But from the fact that the supporting limbs are on the same side of the body, to preserve equilibrium the movements must be more rapidly performed f. «fc*£QJ? Fie. -The Amble. {Colin.) than in the walk. The gait is, therefore, a faster one, the greater rapidity of the pace being accomplished by the reduction of the time, which cor- responds to the half of the duration of the movement of one leg, since on each side one-fourth of the time is saved. The rate of movement in pacing may approach that of the trot, the velocity often rising to three meters per second. Since the two unilateral propulsive and the two swinging feet always move together, and are always at one time in the same phase of motion, the swinging feet strike the ground together, so that after one pace but two strokes of the feet have been heard. In the rack, which is simply a modification of pacing, the uni- lateral feet act together, but the hind leg in propulsion is somewhat later than the fore foot of the same side in leaving the ground. Four strokes of the feet are heard in this gait, two rapidly following sounds when the feet of
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