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MUSCLE HUtLDING. 19

arm will shake with the intensity of tlić effort. This is tlie reason for the term wibratory. The position should be hołd under estreine contracłion about three seconds, thcn the muscles should be allowed to become soft and the hand should be dropped. In about thruo seconds moro the esereise should be repeated. Tire tendency will be not to work sufficiently hard at first. Every ounce of power that you have must be pul into it, if you are going to gain morę power. It is only by the investment of what you have, that you will gain morę. Naturę gives only what is neecssary—if you make a demand upon your muscles for morę power than you have, natitre will gradually give it to you; hut if you do not use what you liave to the full-eśt extent, you will not be giren much increase.

A few momcnts ago, T said that eaeh exercise should not be continued for morę than three seconds, and that then the muscles should be rclased. The renscn for thifi is that the eirculation may be helped. Wlicn a muscle beeomes hard by vigorous contrac-tion, it tends to foree out all the blood and lymph that is in it. New blood enters in under greater difTiculties than under normal conditions; for this reason the