Bull. U. S. B. F. 1912. 
Plate CV. 
Fig. 112. — Dog. 17. Hyperplasia of the thyroid at the end of five months, from drinking water in which were 
suspended scrapings taken from fish troughs in which carcinoma of the thyroid was prevalent. The same experiment as 
dog 6. figure 111. X160. 
. • */ •. <*• 
♦ u** V,. 
V 
Fk;. 113. — Section of enlarged thyroid of dog 15. Marked hyperplasia of the thyroid with desquamation and degener- 
ative changes in dog drinking water with mud from pond 10. Craig Brook. X160. 
