THE BROAD-SCLEROPHYLL VEGETATION OF CALIFORNIA. 



51 



evident here also. In general, Series II confirms the results obtained 

 in Series I and adds data for the Arctostaphylos community, which is 

 seen to be intermediate in water-content between the other two. 



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Water-retaining capacity. — The reasonable way to compute water- 

 retaining capacity is upon the basis of dry volume of soil. The 

 same is true of water-content, but as yet it is not feasible to make 

 moisture determinations in extensive series on the basis of volume. 

 For the sake of uniformity, therefore, it is convenient to express the 

 water-retaining capacity in terms of dry weight as well as of dry 



