34 



THE WORLD OF LIFE 



CHAP. 



them in order of latitude, from north to south, so as to show 

 still more distinctly the influence of climate. Each main 

 division of the globe will be considered separately for 

 convenience of reference, and we begin with Europe, for 

 which materials are the most accessible, though still far from 

 abundant. 



The recent publication of a flora of Harjedal, a province 

 of central Sweden, with a mountainous surface and abundant 

 forests, shows how poor is a sub-arctic area which has 

 recently been buried under an ice-sheet. The real wonder 

 is that it should have acquired so rich a flora by the natural 

 means of dispersal from more southern lands. 



Temperate Floras of Small Areas in Europe 



(I am indebted to Mr. Herbert H. Field for all the data 

 in this table, except where otherwise stated. They are from 



