Bci-L. U. S. B. F. igi2. 



Plate CII. 



' Jdy%> 



KiG. 10b. — Seclion through largt- tumor domesticated brook trout which under treatment with bichloride added to the 

 running water in the proportion of 1:5.1X10.000 for 3 days and then placed in sLinding bichloride solution 1:300.000. 

 killed by 3'i hours exposnre. Tumor greatly decreased in size. Reversion toward normal type. Fish 1136. table xii. X86. 







T. 



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i»^.f 





Pui 1U7 —Section through niargin of Uirge tumor retrOkTradwl under treatment with liichlorule ol niercury 1 : .Sj.-i .am 

 added to the water fo" I "davs. Marked atrophy of tumor cells, remnants of nests of cells m rnarginal connective tissue 

 presenting a picture similar to regression of carcinoma in mammals. Fish 1065. table xii. Xhb. 



