MKNT 



-cations of Boa* and Winder * that unfuvorable 

 environmental iniliieno-s which cause a child to grow 

 slowly .im mi; a number of act as retarding cause 8 



such that the child will prohahly continue to grow more 

 slowly than other, normal children. Kvcn at completed 

 growth the child is smaller than its normal companions. 

 on the other hand, children who have had their growth 

 accelerated by favorable surroundings reach the adult 

 stage earlier and attain a Iy greater size and de- 



velopment. Thus the absolute size and the relative pro- 



ons of the body are influenced by periods of retarda- 

 tion or acceleration. These periods of change in the rate 

 of growth appear to be due to such retarding causes as: 

 illness in early childhood, malnutrition, lark of fn^h air 

 and | se, to the influences of environment, 



phy.Mcal and social. 

 The conclusion to be drawn from this body of evidence 



.it environment is m.. t as a modifying cause 



in early plastic years. On tin* oth r hand, there are now 

 available sc\< ml -tudies of considerable importance 

 whi.-li -m to show that envinmmnit is not such an im- 

 portant f.i.-tor in tlu dfvrlopmrni of children. These in- 



ications have been made by tin- (J alt on Laboratory 

 for National Eugenics of the Uni of London, un 



f lu- dir.-.-tion of ProtV-vor Karl Pearson. Tli- in- 

 of vision and the relative influence of heredity 

 and environment on sight have been studied* and the 

 >tati-ti.-ians have reached the following conclusions from 

 their admittedly slender data: (1) No evidence whatever 

 that j.overt} stricken homes, or physically 



Ro*s, F.. and Wittier. C. .<?///>. of GrovlA, Report of V. 8. Cow 

 miwtoner of K-ration for 190). pp. 25 132. 

 Lc^omfory Ucv 



