Bull. U. S. B. F. 1912. 
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Ft(;. 114. — Section of tliyroid of dog 20 used as control for dog’s 22, 16 «and 17. 
and 22, but, like control dog 21, boiled before drinking. XI60. 
Received the same water :is<logs 15, 17 
Fig 115. — Dog 22. Section of enlarged thyroid. Well developed hyperplasia after drinking water fiv*e months with 
suspended scrapings from infected fish troughs. The same experiment and result as dog 16, figure 111, and dog 17, 
figure 112. X160. 
