RELATION OF lODIN TO THYROID 



403 



TABLE 2 

 April 18 



sible to prolong the experiment, the animals were killed and 

 preserved for microscopic examination. 



Discussion of potassium iodide feeding experiment. The results 

 of this experiment, while not so interesting perhaps as those 

 obtained by administration of iodin crystals, seemed worth 

 recording in detail. The table of measurements shows that the 

 growth capacities of the larvae receiving potassium iodide were 

 much increased. It is interesting to note in this connection that 

 Adler ('13), in a brief paper dealing with the effects of iodin 

 upon the germ glands of amphibians and mammals, observed 

 that iodin compounds appeared to stimulate the growth rate of 

 the amphibian larvae with which he worked. He records no 

 measurements, however, and made no observations regarding 

 metamorphic changes. 



