Brown Trout 167 
flies, thus preventing the trout from coming so soon into condi- 
June 1903. 
Fic. 164.—4-lb. Loch Crosophuill Trout, Sutherland. 

tion. So much is this the case, that in a warm summer trout grow 
twice as much as they do in a cold one. The changes caused 
