Man 161 



produce their children varies in different 

 parts of the world. It is highest where intel- 

 ligence is highest, and lowest where intelli- 

 gence is lowest. In New England during the 

 seventeenth and eighteenth centuries, the 

 average age at the birth of surviving children 

 was about 33 years for fathers and 3 1 years for 

 mothers. One-half of all surviving children 

 were born before their fathers were 32. These 

 averages are about the same as the average 

 for western Europe. The average age of the 

 fathers of 354 great men was found to be 

 approximately 40 years, or seven years over 

 the normal age. Over 80 per cent, were born 

 after their fathers were 32. The average age 

 of the fathers of ten especially great men from 

 different countries and from different races, 

 was found to be approximately 55 years. This 

 list of ten men consists of Aristotle, Augustus, 

 Bacon, Buddha, Confucius, Cuvier, Franklin, 

 Humboldt, Ptolemy II, and Solomon. It 

 probably would be difficult to make another 

 list of ten men representing an equal amount 

 of intellect as that possessed by the ten whose 



