We shall see by reference to stride No. 5 the consecutive supporting feet to be: 1. The left hind foot. 2. The left hind and left fore feet--_laterals_. 3. The left fore foot. 4. The left fore and right hind feet--_diagonals_. 5. The right hind foot. 6. The right hind and right fore feet--_laterals_. 7. The right fore foot. 8. The right fore and left hind feet--_diagonals_. The right fore foot being raised, the horse is again in the first position. The amble and the walk are the only regular progressive movements of the horse wherein the body is never without the support of one or more legs, in all others the weight is entirely off the ground for a longer or shorter period. _The Rack or Pace._ The rack differs from the trot in the nearly synchronous action of the _laterals_ instead of the _diagonals_. In some countries the rack is naturally adopted by the horse as one of his gaits, but it is probably caused by the effects of training exercised over many generations of his ancestors. The movements already described are regular in their action, and a stride may be divided into two parts, which are essentially similar to each other. _The Canter_ and the gallop, however, cannot be so divided, and a complete stride in either of those gaits is a combination of several different movements. The canter is usually regarded as a slow gallop, probably from the facility with which a change from one gait to the other can be effected; an important difference will, however, be observed. Assuming a horse after his propulsion through the air, during a stride of 10 feet, to have just landed on his left hind foot, the right hind foot will be on the point of passing to the front of the left. The left fore leg will be thrust forward and nearly straight, while the right fore leg will be flexed with the foot elevated about 12 inches from the ground, and somewhat behind the vertical of the breast. The left fore foot being brought to the ground, the body is supported by the laterals; the right hind foot is, however, quickly lowered, and performs its share of support. The left hind foot is then raised, and the right hind and left fore legs assume the weight, the former being nearly vertical, and the latter inclined well back, the right fore foot is thrust well forward, and is just about to strike the ground; when it does, three feet again share the support, they being the two fore and the right hind. The left fore foot now leaves the ground, and we again find the support furnished by the laterals, the right instead of, as before, the left. The right hind foot is raised when the right fore leg becomes vertical; this latter, which now sustains the entire weight, gives the final effort of propulsion, and the body is hurled into the air. The descent of the left hind foot completes the stride, and the consecutive movements are repeated. In stride No. 7 we learn that during the canter the support of the body is derived from