Experiiiieiital ( )peruti(jna on tin- I'ituitaiv 95 



In both cases deatli followed the extensive removal of the pars anterior 

 hliiii n ff'W liniirs 



within a few hours. 







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e 



'i^' 



V 



V 



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Ficj. 20. — Section of the tliyioid of ilog f). 70 lioiirs after removal of -i urge 

 j)ortioti of jiars aiiterioi'. ( I'liotomiciograpli x 40. ) 



Fig. 21. — Section showing large piece of pars anterior removed from dog 3. 



t Photomicrograph x 15.) 



Nothing abnormal was observed in the other endocrine organs after opera- 

 tion. The thyroid of bitch No. 5, 70 hours subsequently, is shown in fig. 20. 



