Bull. U. S. B. F. 19 12. 



Platk XCV. 



Fig. 91. — Section of thyroid showing spontaneous recover\- from carcinoma of the thyroid. Karly stage. Wild 

 Wisconsin brook trout. Fish No. 2099 A. X86. 



Fig. 92. — Section showing spontaneous recovery from experimentally induced carcinoma of the thyroid in wild 

 Wisconsin brook trout. Fish No. 2099 B. X86. 



