M« 



163 



The data for the following table was ob- 

 tained from the genealogies of New England 

 families. 



Ages of 2564 Grandfathers when Grandsons Were 



Born, and Numbers of Grandsons at Different 



Ages of Grandfathers. 



D 

 56 



57 

 53 

 59 

 60 

 61 

 62 



63 

 64 



65 

 66 



67 

 68 

 69 

 70 



Dividing the whole number into four 



