Plate XCVIII. 
Ki(i. 98. — Marked hyperplasia domesticated brook trout used as control for figure 99. Fish 1070, table ix. X86. 
Fi(i. 99. — Fish from same lot treated by adding in continuous concentration potassium iodide in the water 1:5.000.000. 
Marked regression of hyperplasia at the end of 27 days. Fish 1069, table ix. X86. 
