Plate CIV. 
Bull. U. S. B. F. 1912. 
Hu;, no. — .Section of thyroid of doR 21 used as control for dog 16, figure 111. Received .same w.ater as dog 16 but 
boiled. X16U. 
Fig. 111. — Section of thyroid of dog 16. Marked enlargement of the thyroid, well developed hvperpla.sia a.s the result 
of drinking water in which were suspended scrapings from fish troughs in which carcinoma of the thvroid in fish was 
prevalent. X160. 
