would be ordinarily classed as swell-butted, the excess by the volume table 

 was 17,530 feet B. M., or a very large percentage of the total difference. 

 If we eliminate these ten trees and include only the eighty-five normal 

 trees we find that the difference is only 6,550 feet B. M. in 378,360 

 feet scaled contents, or only 1.7 per cent difference. 



These data show quite conclusively that the volumes as given for the 

 Willamette Volume Table for Douglas fir are readily applicable to normal 

 Douglas fir timber in the Olympic National Forest. Although they are 

 applied only in the northeast portion of the Forest, it is reasonably sure 

 that normal trees in other portions will not show a greater variation 

 from the volume table. 



TABLE III. 

 Per Cent of Total Scale of Tree Contained in Butt Log, 2nd Log, and Top Log. 



long. 

 Log Volume Compared to the Total Volume. 



Table III. In order to arrive at some conclusion concerning the 

 percentage of the total volume contained in the butt log, second 

 log and the top log, Table III was constructed. It has been very apparent 

 in timber survey work that some such data are essential in order that 

 such factors as defect and breakage might be more correctly judged by 

 the field men. 



In the third column it is seen that the butt contains from 27.3 per 

 cent to 50 per cent of the total volume of the tree. There appears a 

 tendency for the butt logs of the smaller diameters to contain a greater 

 percentage of the volume, although the lack of sufficient data makes 

 the exact per cent a doubtful figure. The average per cent for all sizes 

 is shown as 33.7, and this figure appears to hold fairly close for trees 

 above 36 inches in diameter. 



The second log contains from 22.5 per cent to 34.2 per cent of the 

 total volume of the tree, with an average of 26.0 per cent. The diameter 

 of the tree appears to have little effect upon the percentage in the second 



36 



