1 84 



Dynamic Evolution 



way. Of the 582 persons born when their 

 fathers were 34 or less years of age, 27, or 

 4.65 per cent., lived to the age of 90; while of 

 the 523 born after their fathers were 35 years 

 of age, 32, or 6.12 per cent., lived to the age of 

 90. Also, taking the 83 born before their 

 fathers were 25, and the 71 born after their 

 fathers were 50, we have: 



Living at 80 Living at 00 



Fathers less than 25 12 None 



Fathers over 50 46 4 



The distribution of infant mortality was 

 not investigated extensively, but the 1 13 cases 

 found are sufficiently numerous to show that 

 the ratio of infant deaths to total births 

 increases uniformly as the parents grow older. 



Ages of 

 Fathers 



Infant 



Deaths 



Under 26 . 11 



26 to 30 23 



31 to 35 23 



36 to 40 20 



41 to 45 19 



46 and over.. 17 



Percent- 

 age of 

 Deaths 



9-734 

 20.354 

 20-354 

 17.800 

 16.710 

 15.048 



Percentage 

 of Births 



12.890 

 25-056 

 24.719 

 18.056 

 II.777 

 7.502 



M. 



75-525 

 81.234 

 82.341 



. 98.026 

 142.759 



.200.600 



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