Bull. U. S. B. F. 1912 
Plate XCIII 
Fig. 88. — Wiki Wiscon.sin brook trout. Fed iiuirine fi.sh 12 niontlis. Normal thyroid. XSfi. 
Fig. 89. — Wild Wi.scoirsin brook trout. Vegetable food 12 months. Normal thyroid. XS6. 
