GROWTH AFFECTED BY FEEDING DUCTLESS GLANDS 



321 



TABLE 5 



Comparison of principal data for control ynale albino rats with the Wistar Tables 

 of Donaldson {'15). Weight is the average expressed in grams. Comparison is 

 made with the Wistar norjns of the same body length and of the same gross body 

 weight. 



WISTAR 



(same body 

 weight) 



Body length, cm 



Gross body weight, g. 



Tail-Ratio 



Age (days) 



Organs : 



Brain 



Eyeballs 



Heart 



Kidneys 



Liver 



Spleen 



Lungs 



Alimentary Tract. . 



Testes 



Hypophysis 



Suprarenals 



Thymus* 



20.6 

 215.0 

 0.85 



grams 



1.885 

 0.280 

 0.847 

 1.820 

 10.590 

 0.572 

 1.251 



2.267 

 0.008 

 0.036 



* Thymus compared with regard to age (193 days average for older group, 

 and 90 days average for younger group) instead of regard to body length or weight. 



('13), however, the growth of the eyeballs may tend to be cor- 

 related with age, rather than with body weight (as is known to 

 occur in the thymus). These differences may therefore be due 

 to age changes, to normal variability, or perhaps merely to 

 differences in the technique of removal of the eyeballs. 



b. Thyroid groups. The eyeballs average heavier in relative 

 weight than those of the controls in both sexes, but the differences 

 obtained are slight and probably of no significance. Comparison 

 according to the method of Donaldson ('15) shows them slightly 

 lighter in weight in the males than those of the corresponding 

 controls, but in the females slightly heavier. 



c. Thymus, hypophysis and pineal groups. In most cases, 

 the eyeballs in these groups average relatively slightly heavier 

 than those of the controls. No particular significance other 

 than variability is attached to this fact. 



