Plate CIII. 
108 — Section throuyrli tumor of two-year ol<l brook trout treated witli bichloride of mercury added by continuous 
how to tlie water in proportion of 1 :.S.()i)U. ()()(». Result at tlie end of 11 days. (Ireat reduction in size of tumor. Reversion 
of tumor tissue to the normal type. Fish 1144. table xii, X86. 
Fi(^. 109. — Domesticated bnjok irout. Visible tumor. Marked diminution in size of the tumor and marked change in 
tumor tiss\ie with reversion toward normal, as the result of treating for 22 days with arsenic trioxide added by continuous 
flow to tlie water. Note market! change in epithelium. Fish 2036, table xiv. X86. 
