PREFACE. Vll 



perhaps, in favour of his making choice of that which is least 

 adapted to practice. 



While thus much may be said of the Author and his work, 

 it is at the same time necessary to explain why no mention is 

 made of some sorts which are common in particular districts. 

 In such cases it is to be understood, that the variety omitted 

 is considered either so like some kind already described as 

 to be undeserving of particular notice, or so little valuable as 

 to be unworthy of cultivation. 



In all other respects the work speaks for itself. Under 

 that impression, the Editor would only add, that nothing in 

 the following pages is to be ascribed to himself, except the 

 introductory matter, and such typographical errors* as may 

 have remained uncorrected during the progress of the work 

 through the press. 



London, July 1, 1831. 



* These have been carefully examined and corrected. 4. 



