TABLE 11 



Showing the increase in the tveight of the body with age for 99 male and for 76 female 



rats belonging in the seventh to the fifteenth generations of the A series of inbreds 



TABLE 12 



Shoiving the increase in the ivQight of the body with age for 57 male and for 93 female 

 rats belonging in the seventh to the fifteenth generations of the B series of inbreds 



25 



