If unable to change the edge by this method, the skater may assist himself by slightly and gently swinging the arm and leg outward, so as to incline the person to a rotatory motion. This swing, however, must be corrected as soon as the object is attained; and it must generally be observed that the change from edge to edge is to be effected merely by the inclination of the body, not by swinging. When the skater is able to join the ends of the 3, so as to form one side of a circle, then, by striking off in the same manner, and completing another 3, with the left leg, the combination of the two 3’s will form an 8. In the first attempts, the 3 should not be made above two feet long, which he will acquire the power of doing almost imperceptibly. He may then gradually extend the size as he advances in the art. Though, in this section, backward skating is spoken of, the term refers to the skate only, which in such case moves heel foremost, but the person of the skater moves sidewise, the face being always turned in the direction in which he is proceeding. OUTSIDE EDGE BACKWARDS. Here the skater, having completed the 3, and being carried on by the first impulse, still continues his progress in the same direction, but on the other foot, putting it down on its outside edge, and continuing to go backwards slowly. To accomplish this, the skater, after making the 3, and placing the outside edge of his left foot on the ice, should at once turn his face over the right shoulder, raise his right foot from the ice, and throw back his right arm and shoulder. (Plate XIX. fig. 2.) If, for awhile, he is unable readily to raise that foot which has made the 3, and leave himself on the outside of the other skate, he may keep both down for some distance, putting himself, however, in attitude of being on the outside only of one skate, and gradually lifting the other off the ice as he acquires ability. When finishing any figure, this use of both feet backward has great convenience and beauty. Before venturing on the outside backward, the skater ought to take care that the ice is clear of stones, reeds, &c., and also be certain of the good quality of his irons. When going with great force backward, the course may be deflected, so as to stop by degrees; and, when moving slowly, the suspended foot may be put down in a cross direction to the path. Such are the four movements of which alone the skate is capable: namely, the inside edge forward; the outside forward; the inside back; and the outside back; in which has been seen how the impulse for the first two is gained, and how the third flows from the second, and the fourth from the third. By the combination of these elements of skating, and the variations with which they succeed each other, are formed all the evolutions in this art.