Bull. U. S. B. F. 1912. 
Plate CVII. 
Fi(i. 116. — Section of normal thyroid of adult female dojr, mother of dog’s 15. 16. 17. 20. 21 and 22. used a.s control for 
dog 18. figure 117. Received same water but boiled before drinking. X16U. 
Fi(i. 117. — vSection of markedly enlarged thyroid of adult dog 18. Result after five months drinking water in which 
were suspended scrapings from fish troughs in which carcinoma of the thyroid in trout was continually developing. X16n. 
