76 



NORTH AMERICA 



of the intensity and total amount of plant-life from 

 north to south, from centre to margins, with a maximum 

 in the south and east : a western fringe more equable 



Fig. 18. Physical Features of North America. 



and moderate in climate than the central and eastern 

 portions at the warm and cool temperate latitudes. 

 North America, however, is a smaller continent, and its 

 relief is not 'drawn on the gigantic scale of that of Asia, 



