Bru.. U. S. B. F. 191 2. 



Plate XCIX. 





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i'%m 









l-lc, 1"" — Hvbrid yearling salmon. I.nrge protnulinK tumor showing marked change with reversion toward normal 

 type as the result of treatment with iodine added to the water by continuous flow in the proportion of 1 : 5.000.000 for 24 

 days, (ireat visible reduction in size of tumor. Fish 1083. table ix. X86. 





FIO. 101.— Section through tumor retrograding as tlie result of treatment with potassium iodide added to the water 

 by continuous flow in a concentration of 1 : 5.000.0{«1, at the end of Jl days. Large area shownng organization by connective 

 tissue, previous hemorrhage in substance of tumor induced by treatment. C.reat reduction m size of tumor. Hsn lowr. 

 table IX. XU6. 



