342 



HEREDITY AND SELECTION IN SOCIOLOGY 



ASHTJAL DeATH-KATES AT DIFFERENT GROUPS OF AGES (1870-1900). 



Deaths pee 1,000 Living Males. 



If we come to examine these figures, we find that the rate of 

 mortality among persons from to 20 years of age has regu- 

 larly and steadily diminished. On the other hand, the mortahty- 

 rate among persons of thirty-five years of age has diminished, 

 it is true, but only from 13-8 to 12-5 in thirty years, whereas 

 the mortality of infants under five has diminished during the 

 same period from 75-0 to 58-0 ; that of children from five to ten 

 years of age from 8-9 to 3-9 ; and that of children from ten to 

 fifteen years of age from 4-5 to 2 2, or less than half. On the 

 other hand, there has been a positive increase in the rate of 

 mortality among persons of forty-five years of age and upwards 

 in every category which we have considered. Whereas the mor- 

 tality-rate for persons of forty-five to fifty -five years of age was 

 19-6 in 1870, it was 20-8 in 1900 ; that of persons from fifty-five 

 to sixty-five years has increased during the same period from 

 33-9 to 38-9. 



Among women the same phenomenon is witnessed. 



The figures on p. 343 reveal the same phenomenon as the pre- 

 ceding ones. Among females under twenty years of age the rate 

 of mortality has steadily and regularly diminished ; whereas 

 64-2 per 1,000 infants under five years of age died in 1870, only 

 48-2 per 1,000 died during this period in 1900 ; the rate of mor- 

 tality for infants from five to ten years of age has diminished 

 from 8-3 to 3-9, that of children from ten to fifteen years from 

 4-5 to 2-4, or less than half. On the other hand, the mortality- 



