Bui.L. U. S, B. F. 191 2. 



Platk XCVI. 





v^>^ 'CS\. 





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Fig. 93.— Section thyroid region domesticated yearling. Cold Spring Harbor hatchery, kept in old troughs. Raw liver 

 and heart feeding. Well developed hyperplasia. X86. 



^■u„/^f'nV~Y'''i'^^''"' ''"""'^''^'ed hrook trout. Cold Spring Harbor hatchery. Same lot of fi.sh as figure 93. Kept in 

 water of Church Spnng. Raw liver and heart feeding. Normal thyroid. X86. 



