LAWS OF THE STERILITY OF WOMEN. 



321 



The demonstration of these proportions is arrived at by showing the proportional 

 numbers bearing at different years of married life, according to age at marriage. 

 This is an indirect way of proceeding, but it is the only one I can find available, 

 while I have no documents giving the ages of mothers at marriage, and their ages 

 at birth of last children, the mothers continuing to live in wedlock. 



TABLE III. — Showing the relative Sterility op a mass of Wives Married at 



DIFFERENT AGES AT SUCCEEDING EPOCHS IN MARRIED LlFE. 





15-19 



20-24 



25-29 



30-34 



35-39 



Total. 



Proportion Sterile about the 5th Year of Married | 



2-78 

 35-9 



2-61 

 38-3 



1-68 

 59-4 



1-51 

 66-0 



1-19 

 84-1 



209 



479 



Proportion Sterile about the 

 Married Life is about 1 in . 

 or a percentage of . 



10th Year 



*} 



2-09 

 47-9 



1-71 

 58-3 



1-39 

 71-8 



1-24 

 80-8 





161 



62-1 



Proportion Sterile about the 

 Married Life is about 1 in . 

 or a percentage of . 



1 5th Year 



of| 



1-57 

 63-8 



1-32 

 75-5 



1-10 

 90-9 



1 05 

 95-5 





1-26 



79-2 



Proportion Sterile about the 

 Married Life is about 1 in . 

 or a percentage of ... . 



20th Year 



- } 



1-24 

 80-4 



113 

 88-6 



101 



98-7 







111 

 89-8 



Proportion Sterile about the 

 Married Life is about 1 in . 



25th Year 



° f } 



102 

 97-6 



100 

 99-65 



... 







101 

 99 03 



Table III. gives the calculated amounts of sterility at different periods of 

 married life in women married at different ages. It is needless to enter on the 

 method of construction of this Table. It is merely the complement of Table XV., 

 given in my former paper, where full details are stated. I shall only state, that 

 this Table is all calculated for 20 months, with a view to giving the nearest 

 accurate estimate, 20 months being what I have called the time-unit of fertility, 

 the shortest time within which all women may be expected to show fertility if 

 they possess it. 



Chapter VII.— Expectation of Relative Sterility. 



As a sort of appendix to this paper, I produce five Tables, giving all the 

 details of the expectation of continued fertility ; and conversely, of relative 

 sterility. These Tables not only give data for calculating the chances of relative 

 sterility, but also for calculating the probable number of the family produced in 

 women at different ages becoming relatively sterile. To enter further upon these 



