Observations of May 26. 



Observations of June 18. 



Thyroidless iodine-fed. 



Culture 1 . 

 2. 

 3. 

 4. 



Normal iodine-fed. 



Culture 1 . 

 2. 

 3. 



Thyroidless control . 

 Normal " 



Total 

 length. 



mm. 



24.5 

 28.0 

 29.0 

 27.0 



Condition. 



Emaciated. 



n 



Good. 



Completed metamorphosis, June 12 to 18. 

 Emaciated. 



Good. 



Mortal- 

 ity. 



* Fore limbs of three animals breaking through the skin; culture meta- 

 morphosing. 



164 



