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



PLATE XCI. 



FIG. 84. Section of wild Wisconsin brook trout. Raw liver feeding- 12 months. Focal development carcinoma of the 

 thyroid. Small group of follicles with columnar epithelium. Reduced colloid. Hyperaemia about follicles. At periphery 

 normal unaltered thyroid follicles. XS6. 



FIG. 85. Wild Wisconsin brook trout. Raw heart feeding 12 months. Beginning carcinoma of the thyroid. XS6. 



