ADVANTAGES OF ENTOMOLOGY. 67 



and the fishes which live on them would be 

 glutted to satiety and fatal repletion at one time, 

 and at another might want the necessary support. 

 But we see species after species arrive in succes- 

 sion to fill up the breaks made by the last ; and 

 that no inconsiderable interruption may occur by 

 variation in temperature, and changes in weather, 

 some are destined to appear when cold and storms 

 prevail, while others require cloudless skies and 

 genial warmth to draw them from their seclusion. 

 The whirling dun thus frolics in the gale, the red 

 spinner dances in the sunny beam, and the blue- 

 blow braves the chilling day. The observant 

 angler makes a practical use of all this, and frames 

 his mimic art accordingly" 



The intelligent reader will find, in the above 

 extract, hints that will serve as a safe clue to much 

 interesting and useful information. He will be 

 inclined to think that a partial knowledge at least 

 of entomology will be necessary to make him a per- 

 fect fly-fisher. He will find that each month pro- 

 duces its particular flies, with some that are common 

 to most months and waters, and with imitations of 

 these he will angle. He will find that the first 

 spring flies are generally olive coloured, reddish 

 and brown ; that as spring advances, various duns, 

 not as yet very light ones, come on together with 

 larger flies of mottled wings, and yellow and dark 

 bodies. In the last spring month, appear such 



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