CI.'Ol'TND-WOOD PULP. 



43 



have been belter. The fact that the majority of the tests were 

 made after the wood had seasoned from one to one and one-half 

 years might also account for the more satisfactory operation of the 

 material. The yield was approximately 2,060 pounds per hundred 

 cubic feet of solid rossed wood. 



Fig 31. — Western hemlock ( Tsuga heterophylla). 



Jack pine (Pinus divaricata) yields a very good pulp when ground 

 with a rather dull stone, necessitating, of course, a high power con- 

 sumption. The pulp produced at a consumption of from 90 to 100 

 horsepower per ton for 24 hours compares favorably with white 

 spruce pulp made with a somewhat lower power consumption. In 



