Proper Nutrition 



153 



ous localities, Dr. Emerson believes that from 

 20 to 40 per cent, of children at the pre-school 

 and school age in this country show physical 

 and mental signs of mal-nutrition. One of the 

 surest methods of recognizing this condition 

 consists in observing the relation between 

 weight and height, as children who are habitu- 

 ally underweight for their height may usually 

 be considered as under-nourished. In consider- 

 ing what range of variation may be compatible 

 with health, 10 per cent, of under weight is taken 

 as a working hypothesis by Dr. Emerson, as 

 shown in the following table, — 



