RELATION OF GLANDS TO IODINE AND METAMORPHOSIS. 4! I 



TABLE III. 



Bltfo PlTUITARY-THYROIDLESS TADPOLES. 



IODINE FEEDING BEGUN JULY 8. 

 Condition at End of Experiment. 



tadpoles represented in Table IV. were killed about two and one 

 half months later and were then not only of larger size but older 

 as well. Data are accumulating to show that the hind limbs 

 continue to grow proportionately longer in older specimens than 

 in younger ones of equal size. This seems to be generally true 

 of thyroidless, of pituitaryless and of thyroid-pituitaryless 

 tadpoles. More data upon this point must be gathered before a 

 final conclusion can be reached because there are decided indi- 

 vidual differences in the rate of limb growth in normal and oper- 

 ated tadpoles under apparently identical food conditions. In 

 any case, a comparison of Tables III. and IV. will serve to answer 

 any possible objections upon this score. 



Fig. 2 shows the modifications of body length and leg length 



