326 forestry Quarterly. 



actual field measurements. The remaining diameters were arbi- 

 trarily grouped into the following: 



Pole Group /' to 10" D. B. H. 



Tie Group, 11" to 15" D. B. H. 



Sawlog-Tie Group, ..15" to 20" D. B. H. 



Sawlog Group, 20" to 24" D. B. H. 



The arithmetical mean number of linear feet of props was 

 then computed from the averages secured by actual measure- 

 ments for each group in each site quality, and the result used 



LODGEPOLE PINE- 



Site Quality Volume Table. 



Arapaho National Forest, Colorado 



from actual scale and count of logs, ties and props ; 

 scribner rule, dec c. 



Values read from curves and harmonized with those of regular Vol. table. 



Basis, 206 trees. 



Site Quality I Site Quality III 



Ft. Aver. Feet Lin. Ft.) Aver. 



Trees smaller than 11" yield only small sawloRS and props. From trees 

 16" to 20", one or more sawlogs are butted off before ties are made. Trees 

 over 20" usually made wholly into sawlogs and props. Props include all 

 material from last tie to 5" point. No allowance made here for defect. 



Stump height=i foot. 



