BULL. U. S. B. F. 1912 



' .. 



PLATE XCVI. 





FIG. 

 and heart 



93. Section thyroid region domesticated yearling, Cold Spring Harbor hatchery, kept in old troughs. Raw liver 

 feeding. Well developed hyperplasia. X86. 



ft* ~^V $f$ jJH& ^~***~~ ' -~-~* <- -> ^****^S -^v _ ^.,. -a*^^*^^^^ * '" * 



mft^~ * " V ir s * -' " " 





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. 



