76 



CELL-DIVISION AND GROWTH 



II. 2 



tudinal and transverse parts, such as stature and width of head. 

 The correlation between stature and weight is high. 



To whatever cause it may be due this diminution of correlation 

 with age is of the greatest interest, since it points to an in- 

 creasing power of self-differentiation in the parts of the body. 

 From other sources also there is evidence of a progressive loss 



.40 

 Correlation 



0). -30 H 



Height sitting 



and length of -20 



head ' .10 



Variability 



(s '} 



Stature. 



Rate of Growth 



(Percentage 



increments of 



stature). 



3% 

 2% 

 1% 



i r 



T i 1 1 1 1 1 1 1 1 



Years. 7 8 9 10 11 12 13 14 15 16 



FIG. 42. Figure to show how the rate of growth (percentage incre- 

 ments of stature), the variability (of stature) and the correlation 

 coefficient (between height sitting and length of head) rise together at 

 the time of puberty in man and then fall together. (Constructed from 

 the tables of Boas.) 



of totipotentiality of the parts, of an increasing independence 

 of the parts, of a tendency to be increasingly governed in their 

 development by factors that reside wholly within themselves. 

 But this evidence must be discussed elsewhere. 



