190 



THE RATE OF GROWTH 



[CH. 



The growth-rates of head and body differ still more; for the 

 height of the head is no more than doubled, but stature is trebled, 



Height of the head in man at various ages * 

 (After Quetelet, p. 207, abbreviated) 



Men Women 



Fig. 48. 



Ratio of stature in man, to span of outstretched arms. 

 From Quetelet's data. 



between infancy and manhood. Diirer studied and illustrated this 

 remarkable phenomenon, and the difference which accompanies and 



* A smooth curve, very similar to this, is given by Karl Pearson for the growth 

 in "auricular height" of the girl's head, in Biometrika, ni, p. 141, 1904. 



