546 ZONES AND REGIONS [Pt. Ill, Sect. II 



WINDS IN THE NORTH AMERICAN FOREST DISTRICT— Continued. 



WINDS IN THE NORTH AMERICAN PRAIRIE. 

 (After Woeikof, Bd. II, p. 33.) 



3. CLIMATE AND VEGETATION IN RUSSIA. 



Southern Russia is occupied by treeless steppes, which, in the north and 

 west, assume the character of meadow, with groups of trees and bushes 

 becoming ever more and more numerous until they gradually give place 

 to forests ; to the east and south-east, on the contrary, their vegetation 

 becomes scantier and they merge into the Caspian desert. On the south 

 the steppe is bounded by the Black Sea. 



