From Savagery to Civilizatioii 59 



result. Exogamy is one of the many ways em- 

 ployed by different races to interfere with early 

 reproduction and to compel the would-be hus- 

 band to do an extra amount of work before he 

 can have his mate. 



Races of men have risen from savagery to 

 civilization by interfering with the mating in- 

 stincts of the young in such a way as to post- 

 pone the actual age at which production begins, 

 and by the introduction of customs which com- 

 pelled an extra amount of physical and mental 

 effort to be expended before reproducing. When- 

 ever such customs were introduced and main- 

 tained, the tribe introducing them rose, genera- 

 tion by generation, to a higher level of intelli- 

 gence. Whenever a tribe failed to introduce some 

 customs having these general results, that tribe 

 fell by the wayside unless it was protected by 

 isolation from competition with other tribes. 



Exogamy represents one of these methods of 

 interfering with early mating. The custom of 

 purchasing brides is another form of interfer- 

 ence. The young man who must purchase his 

 wife must first spend some time acquiring the 

 purchase price, and the effort to get the price 



