234 SOCIAL HEREDITY AND SOCIAL EVOLUTION 



tion, for in the future, as in the past, union will over- 

 come disunion, and these fragments of peoples, 

 capable of no lasting combinations, capable of no 

 organizations, will disappear before the advance of 

 organization. 



Change of Eace Characters. — ^While the extermination 

 of races has been a factor in social evolution, it has 

 not been the most potent one. More frequently the 

 result of warfare is to destroy certain types of indi- 

 viduals and families within the races so as to produce 

 a profound change in their average nature. The 

 manner in which this has been brought about may be 

 illustrated by considering the effect of migrations 

 upon the Aryan race. 



This people was apparently, at the outset, a pas- 

 toral race of people, who had not acquired the habits 

 of agriculture. As the result of this kind of life the 

 natural increase in population brought about an 

 overpopulation. When such times came the people 

 were in the habit of starting out in the spring in 

 great companies, and migrating for the purpose of 

 finding new homes. Apparently, several of these 

 great migrating periods occurred in the early history 

 of the Aryans. In these migrating hordes every man 

 was a warrior, and, as was naturally to be expected, 

 each man fought side by side with his own relatives. 

 The people as they started out, were one race, but 

 during their journey great changes must have oc- 

 curred among such hordes of people. In the first 

 place, only the most vigorous, the most enterprising, 

 and the most ambitious individuals would start with 

 the migrating companies, for those who were weaker, 

 more home-loving, and less ambitious, would remain 

 behind. This first selection left in the original homes 



