56 THE BROAD-SCLEROPHYLL VEGETATION OF CALIFORNIA. 



THE ATMOSPHERIC FACTORS. 

 Light. 



On August 17, 1917, a series of observations was made to determine 

 the relative light values at the different stations. The apparatus 

 used was the Clements photometer. The observations were made 

 as rapidly as possible in the course of a trip over the trail from 

 station 1 to station 10. The first was made at 2 h 30 ra p. m. and the 



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