214 .EXPLANATORY INTRODUCTION 
vegetative and reproductive organs, its economic products, and finally, 
in the case of the more important orders, its classification into sub-orders 
and tribes, with the more important genera belonging to each. The 
student should work through this part and study as many of the genera 
as possible before leaving the order. This is easily managed in dealing 
with the outdoor collections in our botanic gardens. 
No particular attempt is made in this part of the book to avoid 
technical terms. When a term or abbreviation is used that the reader 
does not understand he should refer to the Index, where an explanation 
will be found or a reference made to Part I, in which the terms used are 
explained. 
