The Double Three is that combination in which the skates are brought from the inside back of the first three, to the outside forward of the second. Here the skater, after having completed one 3, and being on the inside back, must bring the whole of the left side forward, particularly the leg, till it is thrown almost across the right, on which he is skating. This action brings him once more to the outside forward, from which he again turns to the inside back. While he is still in motion on the second inside back of the right leg, he must strike on the left, and repeat the same on that. It is at first enough to do two 3’s perfectly and smoothly. Their number from one impulse may be increased as the skater gains steadiness and skill; the art of accomplishing this being to touch as lightly as possible on each side of the skate successively, so that the first impulse may be preserved and made the most of. The Back Roll is a means of moving from one foot to another. Suppose the skater to have put himself on the outside edge back of the left leg, with considerable impulse, by means of the 3 performed on the right,--not bearing hard on the edge, for the object is to change it, and take up the motion on the right foot,--this is effected by throwing the left arm and shoulder back, and turning the face to look over them; when, having brought the inside of his left skate to bear on the ice, he must immediately strike from it to the outside back of the other, by pressing it into the ice as forcibly as he can at the toe. Having thus been brought to the backward roll on the right foot, he repeats the same with it. The Back Cross Roll is done by changing the balance of the body, to move from one foot to the other, in the same manner as for the back roll. The stroke is from the outside instead of the inside edge of the skate; the edge on which he is skating not being changed, but the right foot, which is off the ice, being crossed at the back of the left, and put down, and the stroke taken at the same moment, from the outside edge of the left skate, at the toe. As in the back roll of both forms, the strokes are but feeble, the skater may, from time to time, renew his impulse as he finds occasion, by commencing anew with the 3. The large outside backward roll is attained by a run, when the skater, having gained all the impulse he can, strikes on the outside forward of the right leg, turns the 3, and immediately put down the left on the outside back. He then, without further effort, flies rapidly over the ice; the left arm being raised, the head turned over the right shoulder, and the right foot turned out and pointed. It must be evident, that the elements described may be combined and varied infinitely. Hence waltz and quadrille skating, &c., which may be described as combinations of 3’s, outside backwards, &c. These are left to the judgment of the skater, and his skill in the art.