Bull. U. S. B. F., 102S. (Doc. 1053.) 



Fig. 26.— Scale of Lake Ilunin her^i^^' (/j. nftoi'n taken September S. 1'.)17, al AlpeiKi, .Mich. 

 Cniversity of Michigan Aluyeuni No. .i220b. Length, 170 millinieteis. Age IV. Scale shows 

 three completed annuli and n small marginal growth 



