124 ROBERT BENNETT BEAN 



reached later in the German. This follows a law, general in 

 nature, that the precocity or rapidity of development is inverse 

 to the ultimate size. 



The precocity of the group is inverse to the ultimate stature; 

 the Americans, the tallest, the Filipinos, the smallest, with the 

 Igorots and Germans intermediate: the Germans taller than the 

 Igorots. 



The Filipinos may have an early rapid development which is 

 from the European standpoint premature, and a late maturity 

 that is incomplete, at least it looks as if growth is continued 

 up to a later age in the Filipinos than in the Europeans, but the 

 extent of development is less. 



The Ann Arbor American children, the Milwaukee and the 

 Berlin children are similar in stature and in periods of growth. 

 The Ann Arbor German children, the Boston German children and 

 the Swiss children are likewise similar in stature and in periods of 

 growth. The Swiss children, however, show considerable retar- 

 dation in growth from the age of 15 onwards, whereas the Ameri- 

 can German children show no retardation until the age of 17 is 

 reached. All the six groups are different from the Turin chil- 

 dren of South Europe. In the latter there is an early rapid growth 

 followed by retardation, and a later rapid growth followed by 

 retardation that is earlier than in the other groups. In this they 

 resemble the Filipinos. 



The urban children of Boston are less rapid in their early de- 

 velopment than the sub-urban children of Ann Arbor and the 

 urban children of Milwaukee are more rapid in their late de- 

 velopment that the sub-urban children of Ann Arbor. The 

 early development of the Ann Arbor and Milwaukee children is 

 about the same and the later development of the Ann Arbor and 

 Boston children is about the same. 



Factors in race and climate or heredity and environment both 

 probably cause these differences. Neither can be excluded. 



