THE NORTH TEMPERATE ZONE 



147 



is the most abundant tree, and reaches its finest development. 

 Some of the trees exceed 200 feet in height with a diameter of five 

 to six feet, or even more. 



Higher up, especially where there is abundant moisture, the 

 yellow pine is less in evidence, and at about 6,000 feet, the white 



/ 



-N 



Fig. 41. — Yellow Pine (Pinus ponderosa). 

 A. Yosemite Valley. 



B 



B. Shasta Springs, 

 Northern California. 



fir (Abies concolor) is the commonest species in the regions where 

 the giant Sequoia (S. gigantea) is found. The latter, unlike the 

 coast redwood is never predominant in the forest, but occurs in 

 small groups, or singly, in a forest made up mostly of other trees. 

 These in the most important grove, the Giant Forest, are princi- 

 pally white fir, and sugar pine; but in the drier and more exposed 



