5 68 



ZONES AND REGIONS [Pt. Ill, Sect. II 



the very abundant atmospheric precipitations which fall, particularly in 

 winter, and the amount of which (200 cm. and more) is attained at only 

 a few other places in the temperate zones. The vegetative season is cool, 

 but of relatively long duration. The soil is a porous gravel, only a few 

 inches deep, and of glacial origin. 



FlG. 310. High-forest of the Sierra Nevada (California). Sequoia gigantea, Lindl. et Gord. 



From a photograph. 



In the latitude of the strongest development of the coast forest the slopes 

 of the Cascade Mountains are clad with lighter woodland of composition 

 similar to that of the coast forest (Fig. 308), but between 42° and 43 N. 



