7 6 



The Salmon 



would be on the ist of June, but we have every reason to believe 

 it would be of the same weight as those coming up in June ; and 

 owing to the growth being greater in summer than in winter, 

 twice as much weight is added during the former season. This is 

 seen all through their life-history. The grilse are small when they 



FIG. 69. loj Ibs. I5th March 1907. 



first appear in summer, but by the end of autumn they have 

 increased to four times in weight. The same thing happens with 

 the small spring run. They weigh about 5 Ibs. to begin with, and 

 go on increasing until they are 12 or 13 Ibs. The increase in weight 

 here, however, is not so pronounced, because this run ceases by the 

 middle of June. 



In the next run, however, the weight increases much more quickly, 



