BULL. U. S. B. F. 1912. 



PLATE CI. 



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FIG. 104. Control for figure 105. Fish 1085. table xn. 



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KIG. 105. Domesticated brook trout from the same lot as fisrure 104. treated with bichloride of mercury added by 

 continuous flow to the water in the proportion of 1 : 5,000.000 for 14 days. Disappearance of hyperplasia. Marked 

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



