Bvi.L. U. S. B. F. IQI2. 



Plate XCVII. 



Fig. 96. — Marked hyperplasia domesticated brook trout used as control for figure 97. Fish 104U, table ix. XS6. 



Fig. 97. — Fish from same lot treated h\ adding in continuous concentration potassium iodide in tlit water 1 ; 5.ut<(i.LM_)u. 

 Marked regression of hyperplasia at the end of 13 days. Fisli 1U39, table ix. X86. 



