To vary the work a little, and to bring special development to particular muscles, now let the pupil stand with arms either hanging easily at the sides, or else held akimbo, the head and neck always erect, with the heels about four inches apart, and the toes turned outward. Raise the heels slowly off the floor, the soles and toes remaining firm on the floor, sustaining the entire weight. When the heels are as high as possible, hold them there a moment; then lower slowly till the whole foot is on the floor again; then rise as before, and so repeat twelve times twice a day the first week, and then twenty-five for the following week, continuing this. If this is not vigorous enough when fifty, after the first month, are tried, it will be found that now this work is telling directly on the size, shape, and effectiveness of the feet and calves, and on the grace and springiness of the step itself. If any boy or girl wants to become a good jumper, or to get decided aid in learning to dance long and easily, he or she will find this a great help. If they even practice it half an hour a day, they will be none the worse for it. All the work thus far recommended here can readily be done in two minutes. Standing erect, with the arms still akimbo, and the feet as before, now bend the knees so as to stoop six or eight inches, then rise to the perpendicular, stoop again, and continue this six times, the feet never leaving the floor. This strengthens the knees, while the front of the thighs get the heaviest part of the work, though the leg below the knee is doing a good share. (It is not unlike the exercise practised so assiduously by Rowell on the tread-mill, and which brought him such magnificent legs that he became champion pedestrian of the world.) By the third week the number may be made twenty-five. If among the scholars there are some who are decidedly weak, twenty-five of these exercises is about the limit. For strong, hearty boys, twice as many will prove nearer the mark. After two or three months of twenty-five movements as described for every day, fifty might be tried once by all the pupils, to see whether it is too severe, and if not, then maintained daily at the maximum. Thus far the feet have not left their particular position on the floor. Now let the pupil stand with the right foot advanced about twelve or fifteen inches, suddenly rising on the toes, give a slight spring, and throw the left foot to the front, and the right back; then spring back as before, and do this six times twice a day the first week, to twelve the second, and twice as many by the end of the month. This calls the same muscles into play as the last exercise, and brings the same development, but is a little more severe and vigorous.