PAN 2 ee 
BY 
J. BRETLAND FARMER 
M.A., D.Sc., F.R.S. 
PROFESSOR OF BOTANY IN THE IMPERIAL COLLEGE 
OF SCIENCE AND TECHNOLOGY 
LONDON 
Sh 
+ 
fs ayy 
Swe ne D, vey 
SoD) 
=< 
x 
NEW YORK 
HENRY HOLT AND COMPANY 
LONDON 
WILLIAMS AND NORGATE 
