Bull. U. S. B. F. 1912. 



Plate CI. 





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Fig. 1U4.— Coiitrul fur fiKure lu5. l-ish liiS5. table xn. X86. 









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1 i(. 1' ^ — Duinesticated brook trout from the siune lot as fiK"re l'.i4. treated with bichloride of mercnr\- added by 

 continuous tlow to the water in the proportion of 1 : 5. 'HH).i)i)(1 for 14 da>s. Uisappearence of hyperplasia. Marked reversion 

 to the normal type. Fish 1084. table xii. X86. 



