404 



W. W. SWINGLE 



TABLE 3 



April 26 



Potassium iodide in flour clearly stimulates the growth and 

 differentiation of limbs. Morse ('14) was unable to produce 

 metamorphic change by administration of iodin compounds to 

 tadpoles, with the exception of iodized blood albumin. In the 

 light of the results obtained by the writer with iodin crystals, 

 it is difficult to understand why this investigator failed to get 

 positive results. His method of feeding the iodin probably 

 accounts for the discrepancy in our results. Why feeding 

 potassium iodide stimulated the growth of tadpoles is not clear. 

 Feeding other iodin compounds gives just the .reverse results, 

 i.e., growth ceases. 



