THE SKELETON AND THE MUSCLES 293 



takes any vigorous exercise. And it is not for the sake 

 of our muscles alone that we should exercise, but for the 

 sake of our brains as well. For clear thinking depends 

 upon a good body as much as does good digestion, and 

 it is just as necessary for the student to attend to exercise 

 in order to keep his body and brain in good working 

 condition, as it is for the professional athlete. 



