' 



LECTURES 



ON THE 



EVOLUTION OF PLANTS 



BY 



DOUGLAS HOUGHTON CAMPBELL, PH.D. 



PROFESSOR OF BOTANY 

 IN THE LELAND STANFORD JUNIOR UNIVERSITY 



Ncfo gork 

 THE MACMILLAN COMPANY 



LONDON: MACMILLAN & CO., LTD. 



1910 



All rights reserved 



