STERILITY OF THE CAPABLES. 



145 



family. As we shall see by the following table, the 

 population produced by the labourer's wife A will in 

 270 years be 2,048, while the population produced by 

 the lawyer's wife B will be half as much, namely, 

 1,024 in the same period. 1 



As regards the men, it is also probable that those 

 who marry at thirty will on the whole be fathers of 

 smaller families than those who marry at twenty-five, 

 even did they mate with women of the same age. 

 Of this, however, I cannot adduce reliable statistical 

 evidence. 



Their Infant Mortality is Greater. 

 The lower classes appear, therefore, to be more 



J For the sake of simplicity the ages at which the men marry 

 have been omitted ; their inclusion would make the case even 

 stronger. 



