PRACTICAL FLY-FISHER. 33 



EEMAEKS. 



ON perusing the former part of this Volume, it will be observed 

 that the intention of the Author was not to write a perfect treatise 

 on Angling ; but a practical detail of the Flies, and the best mode 

 of dressing them, as they appeared on the River Yore, as a guide 

 to the advanced Angler, should he make a piscatorial tour into the 

 North of Yorkshire ; and it was his intention to have described the 

 properties and peculiarities of two or three of our northern rivers, 

 but more particularly of the Aire, Wharfe, and Rye. His object, 

 likewise, was to call the attention of Anglers to the habits of, and 

 modes of fishing for, Grayling rather than Trout ; although what 

 applies to the former is applicable to a certain extent to the latter. 



They are both found existing in the same stream; yet they 

 frequently occupy very different positions in it. 



The Grayling differs from the Trout in this respect, it does not 

 ascend the stream so high, and descends lower than the Trout. 

 Thus very few Grayling are found in cold mountain streams ; but 

 when the Trout ceases to exist, the Grayling continues to be found. 



This circumstance seems to depend upon several properties ; and 

 first, on the temperature both of the external air and the water ; 

 thus they require a warmer temperature than the Trout. If 

 Grayling are placed in the same pool with Trout, fed by a cold 

 spring, the former soon die ; whilst the latter will thrive amazingly. 



Grayling are never found in any quantity in rivers running 

 through exposed mountainous districts ; nor are they found in rivers 

 whose chemical constituents are of a cold, saline nature ; thus the 



