NORMAL MODE OF SECRETION IN THYROID C4LAND 58 



depression of physi()l()i»;ieal efficiency or has been at some pre- 

 vious time, and cnther that the gland has not risen al)ove the 

 level of secretory rate needed for direct export, or that there has 

 been a failure of the normal mechanism of regulation, .^iy ob- 

 servations on the hyperplastic glands of opossums by means 

 of the methods described in this paper have shown that hypei- 

 jilastic glands which appear almost identical histologically may 

 yet tliffer markedly in the amount of these intracellular secre- 

 tion antecedents which the}' contain, and thus, probably, in 

 secretory potential. 



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TKK AMl'.IUCAN .lOTKNAL l)F ANATOMY, VOL. 19, .\0. 1 



