[9] 



OPERATIONS AT NORTIIVILLE AND ALPENA. 



159 



Daily record of sjyawn-takiiitj ohnervuHoiis in hroolc trout — Continued. 

 [From trout 2A .voai's old.] 



[From trout 3 J years old and upwards.] 



Shi2)me)its of brook-trout eytjs. 



