THE .ORIGIN 



OF A 



LAND FLORA 



A THEORY 

 BASED UPON THE FACTS OF ALTERNATION 



BY 



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



\ V 



REGIUS PROFESSOR OF BOTANY IN THE UNIVERSITY OF GLASGOW 



OF THE 



UNIVERSITY 



OF 



WITH NUMEROUS ILLUSTRATIONS 



MACMILLAN AND CO., LIMITED 



ST. MARTIN'S STREET, LONDON 



1908 



