OF FROST AND SNOW 161 



Dalton, pointing out the importance of 

 snow-broth in Canada and in Norway, 

 says that he has found that, while fresh 

 water is absolutely necessary in the river, 

 if sport is to be reckoned on, salmon take 

 the fly better when the snow-water is run 

 down, and the water of the river has had 

 time to get warmed. 



Mr. Rolt writes that snow-water be- Evidence 

 numbs roach, "and to fish for them 

 while snow-broth is in the river is a 

 case of love's labour's lost. While there 

 has been snow in the water, grayling 

 have sometimes fed, while at others they 

 have refused to do so." A possible ex- 

 planation of this apparent contradiction 

 is offered by Mr. Gallichan, whose experi- 

 ence of grayling in Derbyshire streams is 

 that they do not go off the feed in snow- 

 water so long as the temperature does 

 not rise above freezing-point. As regards 

 trout, Mr. Gallichan had it from a reliable 

 professional fisherman in Wales that he 

 had made a heavy catch with worm when 



snow was melting in the river. Mr. 



11 



