Historical Plant Geography — xv— Contents 



Chapter lo 



HISTORICAL CAUSES FOR THE PRESENT STRUCTURE OF 

 AREAS AND THE COMPOSITION OF FLORAS: — 



Phytogeogeaphical contirmation of the theory of con- 

 tinental DRIFT — PhYTOGEOGRAPHICAL ARGTJMENTS AGAINST 

 the theory of CONTINENTAL DRIFT 1 64 



Chapter ii 



CONCEPT OF FLORAL ELEMENTS : — Geographical ele- 

 ments—Ecological ELEMENTS — Historical elements . 202 



