30 



The most striking fact shown by the table is that white pine, which for years 

 occupied first place and was then succeeded by yellow pine, has now fallen to third, 

 having been displaced by the rapidly increasing cut of Douglas fir. 



Computing , 



The section of Computing has made considerable progress in the compilation of 

 forest tables for species found in the National Forests. These tables include volume 

 tables in diameter and height classes for different regions. Lodgepole pine and west- 

 ern yellow r pine tables have been completed and submitted for publication. A large 

 number of stem analyses are still necessary to complete the volume tables for other 

 species. Some data are being gathered in the course of regular work in some of the 

 National Forests, but information obtained is often incomplete. For example, meas- 

 urements on over 800 trees of Engelmann spruce were recently sent in giving stump 

 and breastheight diameters and log dimensions, but not the total height of the trees. 

 As a result, a volume table is impossible, since for this both diameter and height 

 must be known. A very little more trouble would have secured total height meas- 

 urements and made the data much more valua'ble. 



Mr. E. A. Zeigler, in charge of the section of Computing, will visit some of the 

 National Forests during the summer for the purpose of securing additional analyses 

 and getting in touch with Forest officers who may desire to gather measurements for 

 tables for their Forests. 



Stem analysis, height, and valuation survey blanks may be had on requisition and 

 should be used whenever possible for the recording of measurements. 



BRANCH OF OPERATION. 

 OFFICE OF ACCOUNTS. 



Explanation in detail must be made for deductions in salaries of members or 

 others reported on Foim 143. 



When Form 2a subvouchers have not been submitted in time to be included on 

 Form 143 (which is forwarded monthly to this Office for payment of salaries), Form 

 3 salary voucher must be used in stating salary for such members. 



