TABLE 1 



Showing the increase in the weight of the body with age for rats belonging in the 

 first six generations of the A series of inbreds 



* Record not used in constructing graph. 



TABLE 2 



Showing the increase in the weight of the body with age for rats belonging in the 

 first six generations of the B series of inbreds 



Record not used in constructing graph. 



10 



