THE ORIGIN 







OF A 



LAND FLORA 



A THEORY 

 BASED UPON THE FACTS OF ALTERNATION 



BY 



F. O. BOWER, Sc.D., F.R.S. 



REGIUS PROFESSOR OF BOTANY IN THE UNIVERSITY OF GLASGOW 





WITH NUMEROUS ILLUSTRATIONS 



MACMILLAN AND CO., LIMITED 

 ST. MARTIN'S STREET, LONDON 



1908 



