Walking, trotting, and galloping, are the most usual natural paces; but some horses have another natural motion, called ambling, or pacing, which is very different from the other three, and, at the first glance appears extremely fatiguing to the animal, notwithstanding the quickness of motion is not so great as the hard trot or gallop. In this pace the foot of the horses grazes the ground still more than in walking, and each step is much longer. But the most remarkable circumstance is, that the two legs on the same side, for example, the fore and hind legs on the right side, part from the ground at the same time, and afterwards the two left legs, so that each side of the body alternately is without support, which cannot fail to fatigue the animal very much, being obliged to support itself in a forced balance by the rapidity of a motion which is scarcely clear of the ground: for if he raised his feet in this pace, as much as he does in trotting, or walking quick, he could not fail falling on his side; and it is only from almost grazing the earth, and the quickness of motion, that he is enabled to support himself. In the amble, as well as in the trot, there are but two beats in the motion; and all the difference is, that in the trot the two legs which go together are opposite, in a diagonal line; instead of which, in the amble, the two legs on the same side go together. This pace is extremely fatiguing to the horse, and which he should never be suffered to use but on even ground, but is very easy for the rider; it has not the jolting of the trot, because in the amble, the fore leg rises at the same time with the hind leg on the same side, and consequently meets with no resistance in the motion. Connoisseurs assure us, that horses which naturally amble, never trot; and that they are much weaker than others who have not that pace; in fact, colts often get into this pace, when they are forced to go fast, and have not sufficient strength to trot or gallop; and we observe also, that even good horses, when much fatigued, or begin to decline, take of themselves to ambling. We may then look upon this pace as proceeding from weakness or defect; but there are still two other paces called broken ambles, one between the amble and the walk, and the other between the trot and the gallop; both of which are more defective than the amble, and proceed from great fatigue or weakness in the loins; these paces are frequently perceivable in almost worn-out post horses.