II. SIZE OF THE BODY AND ORGANS 93 



It should be noted that, in the case of the Albino, the weight 

 of the suprarenals in the female exceeds that in the male by 

 about 90 per cent for the body lengths here considered. In 

 the case of the captive Grays, however, the female supra- 

 renals are in excess by only about 41 per cent. When, there- 

 fore, the deviations based on the albino standards for each 

 sex are plotted on the same chart, as is here done, the graph 

 for the female necessarily runs below that for the male. 



To determine the difference in relations between the captive 

 Grays and wild gray Norways, the data for the former have 

 been compared with those given in table 206. Such a com- 

 parison shows that in the captive Grays the weights of the 

 suprarenals are, on the average, less than in the wild strain 

 by some 21 per cent in the males and 32 per cent in the fe- 

 males. The suprarenals in the captive Grays have thus lost 

 weight as compared with those in the wild strain, and the 

 greater loss is shown by the females. 



We conclude, therefore, that captivity has reduced the 

 weight of the suprarenals in the captive Grays, and that this 

 reduction is more marked in the female. Such reductions 

 represent a shift toward the weight values for the Albino. 

 The weight relations according to sex are, however, brought 

 closer in the captive Grays, and hence, away from the relation 

 found both in the Albino and in the wild Gray. Thus the 

 female suprarenals appear to be more responsive than those 

 of the male. Finally, after the distinct drop between tin 1 

 values for the wild form and GI, the graphs in chart 20 do 

 not show a progressive diminution in weight from GI to G, , 

 but they do show a high degree of response to unfavorable 

 conditions from G to G 8 a feature of some importance. 



