£4 HELEN DEAN KING 



12. In both series the variabihty in the body weights of males 

 and of females decreased as the inbred generation advanced. The 

 average decrease was about 2 per cent for a group of three gen- 

 erations (table 16). 



13. Inbred males were more variable than stock males up to 

 sixty days of age. After this time stock males showed greater 

 variability in body weight at all ages (tables 15, 17). 



14. Inbred females were more variable in body weight than 

 stock females up to ninety days of age. After reaching maturity 

 stock females tended to be slightly more variable in body weight 

 than inbred females (tables 15, 17). 



15. Males and females of the fifteenth inbred generation were 

 about 35 per cent less variable in body weight than the animals 

 of the general inbred population, and about 40 per cent less 

 variable than the animals in the series of stock controls, (table 17). 



16. The variability in the body weights of the males of the 

 fifteenth inbred generation was somewhat less than fraternal 

 variability in the males of the stock controls. In the corre- 

 sponding female groups variability in body weight was prac- 

 tically the same at all ages (table 17). 



