At the beginning of Chapter XIII. I have labored to make plain the proposition that the pace and the trot are simply two forms of one and the same gait. This is evident from the fact that this gait, in one form or the other, is the intermediate link between the walk and the gallop, and this is true among nearly all quadrupeds. I have also there shown, and I think beyond cavil, that the mechanism of the pace and the trot is the same, and especially in the fact that in both forms two legs are used as one leg. That is, if the two legs on the same side move together, we call it the pace, and if the diagonal legs move together we call it the trot. The rhythm is the same and the sound is the same, and by the ear no man can tell whether the movement is at the lateral or diagonal motion. In all the varieties of steps that a horse may be taught, and in all the methods of progression that he may naturally adopt, there is no step or movement in which he uses two legs as one except in the pace or the trot. From the place, therefore, which these two forms of the gait hold, indifferently, in animal movement, between the walk and the gallop; from the unity of action and result in the use of the same mechanism, and from the wide disparity between the mechanism of this gait and that of all other gaits in the action of the horse, we must conclude that the pace and the trot are one and the same gait. Another evidence of the unity of the two forms of the trot is to be found in the great numbers of pacers that have been changed over to trotters and the astonishing readiness with which they took to the new form of action. To go back no further than the records sustain us, we find that the converted pacer Pelham was the first horse that ever trotted in 2:28. This was in 1849, and four years later the converted pacer Highland Maid trotted in 2:27. Twenty years later, Occident, another, trotted in 2:16¾. These were champions of their day, and when we come a little nearer we find that Maud S. was a pacer and Sunol was a pacer, although neither of them ever paced in public, and the fact that they ever paced at all was held as a kind of “home secret.” Since the days of Pelham, literally thousands of horses have been changed from pacers to trotters, and some hundreds have been changed from trotters to pacers successfully. Then there are quite a number, like Jay-Eye-See, 2:10 trotting and 2:06¼ pacing, that have made fast records at both gaits.