TABLE 4 



Shoioing, by generations, the average body weight at different ages of 99 males belong- 

 ing in the seventh to the fifteenth generations of the A series of inbred rats 



TABLE 5 



Showing, by generations, the average body tveight at different ages of 7G females 

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



* One record only. 



13 



