The under part of the thigh, in the ordinary occupations and recreations of life, does not get as much exercise as the front muscles. A slovenly, shambling gait is characterized by a feebleness of this muscle, while a strong, elastic step is accompanied by a well developed under thigh. With knees unbent, stoop over and try to touch the floor with the fingers, making five or ten thrusts before assuming an erect attitude. Walking or jumping up and down on a plank elevated at an angle of forty-five or fifty degrees with the floor, with the toes toward the higher end, is a good exercise for the calves and the under thigh. Stand on one foot, weight the other, and swing it backward and forward as high as possible. =The Calf.=--Climbing up hill, running on the toes, hopping long distances on one foot-any one of them, if persistently followed, will, in a short time, result in strengthening the calf and increasing its size. Professor Maclaren declares that in four months of Alpine climbing his calves increased from sixteen inches to seventeen and one-quarter, and his thighs from twenty-three and one-half inches to twenty-five. Another exercise, very simple, has been found productive of great good. Stand erect, chest out, shoulders down, knees stiff, feet slightly apart, toes turned outward. Raise the heels as high as possible, throwing the weight of the body upon the toes. Repeat at the rate of fifty to seventy times a minute. One minute’s work will prove sufficient for the exercise. Increase to two, three, or four minutes a day for a month. A gentleman, approaching middle life, who was not satisfied with a calf that girthed fourteen and one-quarter inches, in four months, by this exercise, added another inch. He devoted fifteen minutes to it, morning and evening, and after a time carried a twelve pound weight in each hand. =Pulley-Weight.=--The uses of the pulley-weight are so numerous and so varied that it constitutes almost a complete gymnasium in itself. One of its prime advantages is, that by gradually multiplying the number of weights, it adapts itself nicely to the increasing strength of the individual, and to the varying powers of the different members of the family. It reaches directly every muscle of the hand, wrist, arm, shoulder, chest, abdomen, back, and neck. By the use of an extra pulley near the floor, necessitating a longer rope, excellent drill of the leg muscles is afforded. By sitting on the floor, the latter arrangement is converted into a rowing machine, affording exercise for the arms, back, and legs. =Dumb-Bells.=--These are less expensive but scarcely less valuable than the pulley-weight in the scope and variety of the exercises they afford. They may be of wood or iron, and should not be heavy. For the average person, one and one-half pounds, each, is a good weight. For children, one pound is sufficient.