984 



LIFE : OUTLINES OF GENERAL BIOLOGY 



and his workers in the Gallon Laboratory — which leads them to the 

 important conclusion that the results of changes in nurture are of 

 relatively small importance compared with the results of variation 

 in the physique, the mentality and the habits of parents — that "the 

 degree of dependence of the child on the characters of its parentage 

 is ten times as intense as its degree of dependence on the character 



Fig. 169. 



Eyes of a Crustacean; I, living in darkness, showing relatively small pig- 

 mented area; II, living under illumined conditions, showing relatively 

 large pigmented area. After Doflein, enlarged. 



of its home or uprearing". "It is five to ten times as profitable for 

 a child to be born of parents of sound physique and of brisk, orderly 

 mentality, as for a child to be born and nurtured in a good physical 

 environment." 



Having thus given four reasons which warrant us in regarding 

 the first factor — Heredity — as fundamental, let us state some of the 

 reasons for continuing to attach great importance to Nurture. We 

 have no statistics to offer, nor biological experiments of our own to 



