102 Heredity and Child Culture 



development of the many, is not a proper system 

 and does not make for general and widely dif- 

 fused health and vigor among the young. 



Adolescence 



During the latter part of school life there is 

 ushered in a most interesting period of physical 

 and mental activity, — adolescence. This is the 

 time of life that intervenes between the begin- 

 ning of puberty and the full development of the 

 bodily frame. In the male, this may occupy 

 the years from 14 to 25, and in the female from 

 12 to 21. In the early part of this period there 

 is very marked nutritive activity which usually 

 lessens during the latter part of the interval. 



Up to the beginning of this time the child 

 has lived the life of the race, but now he begins 

 to develop his own individual life, and family 

 traits come out more strongly. There is a 

 rapid growth of the body, especially marked in 

 certain internal structures, such as the bones, 

 heart and lungs and reproductive organs, with 

 increase in blood pressure and in general 

 glandular activity. 



