xvn CARE AND TRAINING OF THE NERVOUS SYSTEM 



245 



person insists on studying immediately after a full meal, 

 when the blood should go to the stomach instead of to 

 the brain, indigestion, so common among brain workers, 

 must be the result. The head and the stomach cannot 

 be active at the same time without bringing on serious 

 disturbances. Mental work should be done when the 

 brain has been repaired and refreshed. The morning 

 is the best time to study. During the day the mental 



2Ci, 



ISO 



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FIG. 133. Showing how the ability to do physical work varies from hour to 

 hour during the school day. The numbers at the top represent the hours 

 from 8 A.M. to 4 P.M., and the numbers at the left, units of work. (From 

 " Report on Child Study Investigation in Chicago," by Dr. Christopher.) 



powers slowly decline in vigor, being low late in the 

 forenoon, and again, late in the afternoon. After sup- 

 per there may be a slight increase in power due to the 

 nourishment taken, but the waste products are still in 

 the blood and interfere with mental work of a high 



order. 



" Early to bed and early to rise, 

 Makes a man healthy, wealthy, and wise." 



