ee PREFACE 
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 slkall, 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 an 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. 
August, 1901. 
