v1 PREPACE . 
A list of the authorities I have chiefly consulted will be 
found on page x. | 
The illustrations have been drawn especially for this book 
by Miss W. L. Boys-Smith, to whose artistic skill, know- 
ledge of botany, and kindly interest, I am much indebted. 
Many of the specimens for the illustrations were most 
kindly supplied me from the Cheltenham Botanical Gardens 
by Mr. W. L. Mellersh. 
Lastly, I wish to express my warmest thanks to my friend 
and colleague, Miss Amy Johnson, B.Sc., whose help has 
been invaluable. ‘The experiments described in the section on 
Physiology are those which she has found practicable for 
class demonstration; and, indeed, there is not a single 
chapter which does not owe much to her suggestion. 
CHARLOTTE L. LAURIE. 
CHELTENHAM. 
October, 1901. 
PREFACE TO SECOND EDITION 
IN preparing this edition every page has been carefully read 
through once more, and only a few slight alterations have 
been made. 
I should like to take this opportunity of thanking my 
reviewers for the very kind reception given to my book. 
CG. i 
April, 1902. 
