156 FRANK LORIMER 



The general rural-urban differential in natality, and other regional varia- 

 tions offer peculiarly interesting research problems at the present time. Psy- 

 chological surveys show great differences in intelligence in different localities. 

 Sociological studies show a great variety of factors controlling migrations 

 within the nation. The significance of such variations in the study of 

 population change is obvious, since families in some areas may be decreasing 

 quite rapidly, whereas families in other areas may be increasing 30 or 50 

 per cent or even more per generation. In general, at present, farm fami- 

 lies have about 50 per cent more children per family than all other classes 

 combined. This suggests that the character of the farm population is a mat- 

 ter of primary eugenic interest. But we do not know what will happen to 

 these regional differentials in the future. The subject has many interesting 

 angles. 



Acute problems are present which demand scientific investigation and 

 thoughtful consideration. There is a wealth of psychological, anthro- 

 pological, medical, statistical, and sociological data at our disposal which 

 has not as yet been adequately exploited for its eugenic implications. 



