■588 



MR. J. A. MILNE ON THE 



being swept down with the current as soon as they leave the 

 lake. 



The question as to the age at which the fry enter the sea is 

 •one which scale-readings should easily settle. So far, I have been 



Text-fig. 104. 





^' 



^. 



■''^. 





.A1 



Scale of Sockeye (O. nerka), $, 3^ lbs. Length 20| inches; girth lOi inches. 



A=eiid of first year's growth. B = migration to sea. 



C = end of second winter, D=end of third winter. 



unsuccessful in my attempts to procure any specimens of fry of 

 known ages for the purpose of seeing how their scales do actually 

 grow, but I give some illustrations of Sockeye scales from full- 

 grown fish (text-figs. 104-106). I have no doubt but that each 



