DISTRIBUTION OF IODINE IN THYROID GLAND 



171 



circuit. Again in all of the experiments except those to be found in 

 table 5 the stimulating current throughout the period of stimulation 

 was made for about 0.8 second at intervals of 1.6 seconds by means of 

 a clock and ratchet device. The strength of the current used and the 

 rate at which the current was made in the experiments of table 5 are 

 described below. 



TABLE i 



Variations in the iodine content of neighboring specimens of the same lobe of the 



thyroid gland 



After a number of experiments had been performed it was found that 

 there is considerable variation in the iodine content of adjoining pieces 

 of the same gland. In table 1, for example, are given a few analyses 

 of neighboring specimens of the same gland. The differences in neigh- 

 boring portions of the glands are somewhat greater in iodine-fed animals. 



