Bull. U. S. B. F. 1912. 



Plate XCIV 



Fig. 90. — ^ Low power section at median line through thyroid region of wild Wisconsin brook trout, .showing well- 

 developed carcinoma of the thyroid infiltrating surrounding structures, bone and cartilage. After 18 months raw liver 

 feeding at Craig Brook. Experimental induction of carcinoma of the thvroid. X13. 



