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



PLATE CII. 



v 





mgk^. 



FIG. 107. Section through margin of large tumor retrograded under treatment with bichloride of mercury 1 : 5.000,000 

 added to the water for 18 days. Marked atrophy of tumor cells, remnants of nests of cells in marginal connective tissue 

 presenting a picture similar to regression of carcinoma in mammals. Fish 1065, table xn. X86. 



