2B. BASIN REGION. 



55 



graphy, which limits the spread of fire, 

 well illustrated by the manner of growth 

 a thin-barked tree very sensitive to 

 above, it forms thickets on the brows 

 rarely originates in the bottoms and 

 bluffs, and a forest fire starting on the 

 ing to the top of a bluff would run down 

 if at all. 



This is pretty 

 of the cliff pine, 

 fi.re. As stated 

 of bluffs. Fire 

 travels up the 

 upland and com- 

 hill very slowly, 



LIST OF TREES. 



