102 



THE RATE OF GROWTH 



[CH. 



J \ I L 



J \ L 



2 4 6 8 10 12 14 16 18 19 

 Age 

 Fig. 9. Annual increase in weight of Belgian boys and girls. 

 From Quetelet's data. (Smoothed curves.) 



10 15 



Age 



Fig. 10. Percentage ratio of female weight and stature to male. 

 From Quetelet's Belgian data. 



23 



