viii HISTORY OF BOTANY 



part of the author. The style of the lecture-room has 

 been retained in the hope that that mode of presentation 

 may render the story more vivid and more readable. 



The author desires to express his indebtedness to 

 several friends who have given him the benefit of their 

 criticism and advice. His thanks are especially due to 

 Dr. D. H. Scott, F.R.S., and to Professor W. A. Herdman, 

 F.R.S., who have very kindly read the whole work in 

 manuscript, or in proof, and favoured him with many 

 valuable suggestions. He desires also to record his ac- 

 knowledgements to Professor F. O. Bower, F.R.S., and to 

 Professor H. H. Dixon, F.R.S., for their kindly criticism 

 of those sections on which they are recognised authorities. 

 To his friend Miss M. Dunt he owes a debt of gratitude 

 for constant help during the preparation of the text 

 for publication. 



HARTLEY BOTANICAL LABORATORIES, 



UNIVERSITY OF LIVERPOOL, 



1919. 



