88 



HELEN DEAN KING 



In figure 7, graph A runs considerably above all of the other 

 graphs, except at the thirteen-day period, thus showing that 

 the growth of the males in the seventh to the fifteenth generations 

 of the inbred strain was exceptionally vigorous. Males in the 

 sixteenth to the twenty-fifth generations were relatively small: 

 in the adult state their average body weights were about 9 per 



Showing the increase in the weight of the body with age and the coefficients of vari- 

 ability for 165 males and for 139 females belonging to a series of stock albino rats 

 that were reared under the same environmental and nutritive conditions as the 

 inbred rats belonging in the twenty-first to the twenty-fifth generations 



cent less than those of the males in the earUer generations, as 

 the position of graph B indicates. 



A comparison of graph B with graph C in figure 7 shows that 

 the body-weight increase with age in the males of the later gener- 

 ations of the inbred strain was, on the whole, very similar to that 

 in the males of the series of stock Albinos reared in 1913 to 1915 

 as controls for the inbred strain: stock males grew somewhat 



