That is nature's method of seeking relief. He has mental dyspepsia, and every opportunity that offers for physical play he accepts. He can not help it, and he ought not to be blamed for it, because it is the natural law. The laws of assimilation govern the brain as well as the body. You can only store up just about so much matter--call it educational material if you will--in a given time. If you undertake to force the physical activity of the brain, you must supply it with more nourishment. If a boy takes no exercise to increase his appetite, if he does not invigorate and nourish his blood, which supplies brain substance, of course there is deterioration. If he has a good stock of reserve physical power he will get on very well for a while, but all at once he will come to a stop. How many hundreds of those who stood well when they entered college get to a certain point and can get no farther, because they have not the physical basis. They are like athletes who can run a certain speed, but can never get beyond that. On the other hand, men who have had a more liberal physical training will go right by them, though not such good scholars, because they have more of a basis back in the physical. When these things are fully appreciated, the whole system of education will be revolutionized. To build the brain we must build the body. We must not sacrifice nerve tissue and nerve power in physical training, as there is danger of doing if gymnastics are not guided by professional men. But the proper training of the body should produce the highest intellectual results. Certain parts of the body bear certain relations to one another. The office of the stomach is to supply the body with nourishment. The office of the heart is to pump this nourishment over the body. The office of the lungs is to feed the heart and stomach with pure blood. All support one another, and all are dependent on each other. If a boy sits in a cramped position in school, that interferes with the circulation of the blood, and that with the nourishment of the brain. You could in this way trace the cause of many a schoolboy's headache. Speaking roughly, we might say that one-half of the school children have a hollow at the bottom of the breast-bone from sitting in such positions, and this depression interferes with digestion. And the moment the stomach gives out, that affects the whole physical and mental condition. When nutrition is imperfect, the action of the heart and the distribution of the blood are interfered with.