PREFACE. IX 



moment when the feeding trout or grayling- 

 is ready for it, and probably he takes more 

 flies in this way than from the surface, and 

 exercises equal discrimination in doing so. 



Let any one consider how an oblong- 

 body, buoyed up by the partial inflation of 

 its envelope, shooting upwards through a 

 troubled intermixture of currents, is likely 

 to behave, and the problem is at any rate 

 rendered less obscure. 



With this endeavour to justify the 

 principles of casting and of selection of 

 flies laid down in the " Fly Fisher's Ento- 

 mology " this tenth edition is submitted to 

 the judgment of the fly-fishing public. 



The plates have been recoloured from 

 a well-preserved copy of the edition of 

 1836 given by the author to his brother 

 Sir Francis Ronalds, F.R.S., in acknow- 

 ledgment of his help in the scientific parts 

 of the book, and a few footnotes have 

 been added. 



Considerations of space forbid the 

 inclusion of previous Prefaces subsequent 



