Bull. U. S. B. F. 1912. 



Plate XCII. 









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Kl<;. 86. — .Section of wild Wisconsin brook tront from same e-xperiment. Natural food 12 months, Norm;d tli>roid. XS6. 



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Kit;. S7. — Section of wild Wisconsin brook tront. Cooked liver feeding 1- months. Xorin;iI th\ roi<l. XS6. 



