PROBLEM OF NURTURE AND NATURE 



Pair 

 Brother and sister 



Pairs of siblings 



Brother and brother 

 Sister and sister 

 Brother and sister 

 Pairs of siblings 



TABLE I (continued) 



Organ 

 Stature 

 Span 

 Forearm 



Eye colour . 



Cephalic index 

 Hair colour 

 General health 



(ii) Pathological characters. 



Phthisis (Pearson) 

 Insanity (Heron) 

 Deaf-mutism (Schuster) 



(iii) Mental characters. 

 Ability 



Temper 

 Handwriting 



Mean .Fraternal Correlation 

 Mean "Nature" value 



Correlation 



55 

 53 

 '44 

 46 



43 

 56 

 62 



4 

 73 



52 

 45 

 49 



52 

 '52 



TABLE II. Strength of Nurture. 



Pair of characters dealt with 



Correlation 



Keenness of vision and home environment as measured by cleanliness 



of body and clothing ... ... ... ... ... ... ... +-07 



Eye disease and overcrowding ... ... ... ... ... ... +-05 



,, ,, ,, economic condition of home ... ... ... ... +-03 



,, ,, ,, physical state of parents ... ... ... ... ... --06 



,, ,, ,, moral state of parents ... ... ... ... ... +-02 



Myopia and age at which child begins to read ... ... ... ... - -08 



Liability to phthisis and destitution of home ... ... ... ... + -02 



Keenness of vision and overcrowding (no. of persons per room) ... - -10 



Myopia and overcrowding (no. of persons per room) ... ... ... --07 



Refraction of offspring and moral state of parents ... ... ... --09 



,, ,, ,, ,, physical state of parents ... ... ... -oo 



,, ,, ,, ,, economic condition of home ... ... --05 



Keenness of vision and moral state of parents ... ... ... ... --02 



Keenness of vision and physical state of parents ... ... ..'. ... --01 



Mental capacity and weight of child ... ... ... ... ... + -04 



stature of child ... ... ... ... ... +-08 



condition of teeth ... ... ... ... ... +-09 



condition of clothing (boys) ... ... ... ... +-04 



condition of clothing (girls) ... ... ... ... +-24 



state of nutrition (boys) ... ... ... ... +-oi 



state of nutrition (girls) ... ... ... ... + -08 



cleanliness (boys) ... ... ... ... ... +'14 



cleanliness (girls) ... ... ... ... ... +-07 



state of glands in children ... ... ... ... +-08 



state of tonsils (boys) --or 



state of tonsils (girls) ... ... ... ... +-n 



