THE HABITS OF THE SALMON. 29 



in the course of the winter, when often no ice is seen 

 on the Shin. These changes have their due effect on 

 the sahnon entering the river at different seasons, 

 for their acute sensitiveness soon leads them to the 

 warm side of the estuary and the river from which 

 the warm water flows. It is well known that salmon 

 during the winter and spring months, when the water 

 of the warmest river is always cold, run on the sunny 

 side of the estuary, that is, as much as possible on the 

 north side, for, from the low course of the sun at that 

 season, the sunbeams reflect strongest on the north 

 side, and there during that time the run of fish is to 

 be found. In the summer months, that is after the 

 ist of May, the fish run on quite the opposite side of 

 the estuary, the high temperature of the water at that 

 time inducing them to seek, and as much as possible 

 to get under, the cool shade of the south banks, where 

 there is the least influence of the sunbeams. In large 

 rivers and estuaries it has always been found that 

 netting has been most successful on the north side 

 during spring and winter, and on the south side 



