PREFACE 



TO 



THE SECOND EDITION. 



The author much regrets the inconvenience occasioned by the 

 unexpected delay in the issue of the present edition. That delay 

 has, however, arisen from causes over which he had no control, 

 and more especially from illness. The whole work has been 

 now very carefully revised, and in some parts rearranged and 

 rewritten, so as to adapt it more than ever to the requirements 

 and convenience of students ; and it is sent forth in the full 

 belief that it will be found to represent, as far as possible, the 

 state of Botanical Science at the time of its publication. 



The author desires to express his obligations to his friends 

 Dr. Trimen and Mr. H. B. Brady — to the former, for the revision 

 of the Third Book, on Physiology ; and to the latter, for sup- 

 plying him with some new dravrings for woodcuts. 



LoxDox: October IS70. 



