Bull. U. S. B. F. 1912 
Plate XCVI. 
Fig. 93. — Section thyroid region domesticated yearling, Cold Spring Harbor hatchery, kept in old troughs. Raw liver 
and heart feeding. Well developed hyperplasia. X86. 
Fig. 94. — Yearling domesticated brook trout. Cold Spring Harbor hatchery. .Same lot of fish as figure 93. Kept in 
water of Church .Spring. Raw liver and heart feeding. Normal thyroid. X86. 
