42 BULLETIN 343, U. S. DEPARTMENT OF AGRICULTURE, 
THE PINES. 
Both the California and Montana lodgepole pine (Pinus mur- 
rayana) yield pulp of very good quality. The wood can be ground 
under ordinary conditions and does not require the consumption of 
a large amount of power. Satisfactory results are obtained when 
the wood is ground at high pressures and at high speed, provided 
the stone is somewhat dull. The color of the pulp from both varie- 
ties compares favorably with that of white spruce, though the 
Montana wood is somewhat lighter than the California. The resin 
did not prove objectionable. Montana lodgepole pine yielded © 
Fig. 30.—Eastern hemlock ( 7'suga canadensis). 
approximately 2,140 pounds of pulp (bone dry) per hundred cubic — 
feet of rossed wood, while California trees yielded about 1,920 pounds. 
The difference was due to the greater age, larger size, and lighter 
weight of the California wood. 
Western yellow pine (Pinus ponderosa) can be ground under a 
wide variety of conditions. The pulp has a fairly long, coarse fiber 
and is invariably soft. In color it tends toward a creamy, resembling 
to some extent that obtained from jack pine. While the wood used 
in the test contained considerable pitch, this did not cause much 
trouble either in the grinding process or in the operation of the wet 
machine. The wood used was cut in October, and it is reasonable 
to suppose that material cut after the sap had gone down would 
