66 From Savagery to Civilization 



that it is not the abstract age of the father which 

 determines the matter. It is the extent to which 

 the father developed his mental powers by men- 

 tal efforts. The age of the father is simply a 

 factor in measuring the amount of his efforts, 

 and consequently a factor in measuring the men- 

 tal development coming from those efforts. 



To enable them to exist with any degree of 

 comfort, men living in cold climates must work 

 much harder than men living in warm climates. 

 This extra work is both mental and physical, and 

 the result of such work is a corresponding de- 

 velopment of mental and physical powers. At 

 the time of reproducing, the man of the north 

 is somewhat more developed than his brother to 

 the south, and their sons inherit the difference. 

 This is repeated generation after generation until 

 small differences grow to be great differences. 

 Then, when there comes a clash of arms, the 

 southern man falls before the man of the north. 



Warlike tribes and warlike nations have al- 

 ways been noted as being superior, mentally and 

 physically, to their more peaceful neighbors. 

 Why ? Looking at the matter closely we can see 

 that it is for the same reason as that before given. 



