From the standpoint of the total cubic-foot vol- 

 ume of material in the stems of good trees of all 

 sizes, the drain exceeded the increment by almost 7 

 million cubic feet (table 17). The total cubic-foot 

 drain, including top wood and cull tress, exceeded 

 the increment of comparable material by more than 

 18 million cubic feet. 



Comparison of the increment and drain of stem 

 wood in tables 16 and 17 and figure 10 shows that 



in both board feet and cubic feet the drain was 

 greater than the increixient. The excess of drain 

 over increment in cubic feet, however, was largely 

 due to the concentration of cutting in the diameter 

 classes above 18 inches. Actually, in under sawlog- 

 size trees and smaller sawlog-size trees the incre- 

 ment in cubic feet exceeded the drain, thus building 

 up the reserve growing stock necessary to replace 

 the present saw-timber inventory. 



34 



