vm PREFACE. 



In referring to the various genera and species of plants, 

 the names by which they are commonly known in horticulture 

 are generally employed, and no attempt has been made to 

 follow any system of botanical nomenclature. 



I trust the work may fulfil the objects aimed at, and 

 form a standard for estimating the merits of exhibits with 

 some degree of precision and regularity, and thus lead to 

 an all-round advance in Horticulture generally. 



W. W. 



March 1892. 



