VOLUME AND YIELD, FIRST-GROWTH HEMLOCK. 



33 



The following' table gives, on a basis of diameter breasthigh, the 

 percentage of the total volume of wood and ])ark of Hemlock, exclud- 

 ing branches, which is merchantable under present logging methods: 



Table 8. — Utilization under present logging methods. 



Diameter 

 breast 

 high, 



Inches. 

 20 

 21 

 22 

 23 

 24 

 25 

 26 



Mer- 

 chant- 

 ible con- 

 tents. 



Per cent. 

 45 

 49 

 53 

 55 

 58 



Diameter 

 breast 

 high. 



Mer- 

 chant- 

 able con- 

 tents. 



Per cent. 

 65 

 65 

 65.5 



Diameter 

 breast 

 high. 



Incites. 

 42 

 43 

 44 

 45 

 46 

 47 

 48 

 49 

 50 



Mer- 

 chant- 

 ible con- 

 tents. 



• cent. 

 73 



The following table gives for Hemlock, on a basis of diameter 

 breasthigh, the length of that part of the stem, including the stump, 

 which will yield clear lumber, according to market specifications: 



Table No. 9 — Diameter and length of stem yielding clear lumber. 



Since the utilization of Hemlock where it occurs in mixture with 

 Fir is of chief importance at present, no consideration is given here 

 to the utilization of pure stands of mature Hemlock. The stand is 

 given for localities where logging is most active and represents differ- 

 ent types of the mixtures of Fir and Hemlock which form the larger 

 part of the commercial forests of the Pacific Northwest. The percent- 

 age of Hemlock in the merchantable stand varies from 28 per cent at 

 Orting to 59 per cent at Buckley. With Wilkcson these localities may 

 be taken as a fair index to the stand of Hemlock on the w^estern foot- 

 hills of the Cascades, where the altitude is from 800 to 1,500 feet and 

 the annual rainfall about 50 to 60 inches. The other places near which 

 measurements of the stand were made were Hoquiani and Elma in 

 Chehalis County, near the coa.st: Little Rock in Thurston County, and 

 22020— No. 33—02 3 



