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 even an hour, and you will usually find that, while often active—indeed, too active—still he does no work which a person of his height need be really strong to do. Put him beside such a person who is not merely large, but really strong and in equally good condition, and correspondingly skilful, and let the two train for an athletic feat of some sort—row together, for instance, or some other work where each must carry other weight in addition to his own. The first mile they can go well together, and one will do about as much as the other. But as the second wears along, the good strength begins to tell; and the slim man, while, perhaps, sustaining his form pretty well, and going through the motions, is not quite doing the work; and his friend is gradually drawing away from him. At the third mile the disparity grows very marked, and the stronger fellow has it all his own way; while at the end he also finds that he has not taken as much out of him as his slender rival. He has had more to carry, both in his boat's greater weight, and especially in his own; but his carrying power was more than enough to make up for the difference. Measure the slim man where you will, about his arm or shoulders, chest or thigh or calf, and the other out-measures him; the only girth where he is up, and perhaps ahead, is that of his head—for thin fellows often have big heads. The muscles of the stronger youth are larger as well as stronger.

Now, take the slim fellow, and set him to making so many efforts a day with any given muscle or muscles, say those of his upper left arm, for instance. Put some reward before him which he would like greatly to have—say ten thousand dollars—if in one year from date he will increase the girth of that same upper left arm two honest inches. Now, watch him, if he has any spirit