Practical Dry-Fly Fishing 



at such a speed that the fly at A, in a 

 much more gentle current, has a pro- 

 nounced unnatural drag over the sur- 

 face. 



Now, turning back to Fig. 6, let us 

 imagine that instead of the water flow- 

 ing in its natural down-stream direction 

 there was an eddy at A moving up- 

 stream and across stream. The drag 

 of the fly would be still more pro- 

 nounced than in the conditions which 

 this diagram is supposed to illustrate. 

 So in all conceivable cases where the 

 direction or swiftness of the water 

 where the fly lights is different from 

 that where the line falls, the drag sets 

 in unless the angler takes some precau- 

 tionary measure to prevent it. 



The preventive measure generally 

 most effective is the slack-line cast. 

 In Fig. 6, the line A, it will be no- 

 ticed, is absolutely straight that is, 



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