THE CAUSES OF DEATH 



127 



the skeletal and muscular systems, shown in Figure 32, 

 presents an interesting pair of curves. Throughout the 

 span of life there is practically no difference between 



ii 

 § 



f 



^ 



10 IS ZO ZS 30 S5 40 'is so S5 60 6S TO 76 BO B5 SO 95 100 

 AGE 



Fici. 31, — ^Diagram showing specific death rates at each age from breakdown of the kidneys 

 and related excretory organs (Group IV). 



the female and male in the incidence of this mortality, 

 the curves winding in and out about each other. The 

 striking characteristics of the curve are: first, that the 

 specific forces of mortality are absolutely low for these 



