GROUND-WOOD PULP. 



39 



be split, before it could be ground. The pulp had a reddish tinge,which 

 made it less suitable for news-print purposes than that of some other 

 woods which grow in the same region. ' The yield was approximately 

 1,915 pounds (bone dry) per hundred cubic feet of solid rossed wood, 

 or nearly 500 pounds less than for white spruce. On the basis of a 

 cord of rough wood 

 the difference in yield 

 would be even greater 

 on account of red fir's 

 extremely thick bark. 

 White fir yields a 

 very satisfactory pulp, 

 especially when the 

 wood is green and 

 comes from young- 

 trees. Tests con- 

 ducted on this species, 

 to note the influence 

 of age of the trees on 

 the quality of the pulp 

 produced, showed that 

 pulp from the split 

 wood of trees 40 inches 

 in diameter and 130 

 feet high was inferior 

 in color, fiber, and 

 yield to pulp obtained 

 from trees of 18 inches 

 in diameter or less. 

 Pulp obtained from 

 the older wood was 

 inclined to be soft and 

 shivy; that from the. 

 younger wood did not 

 show these defects. 

 The color of white-fir 

 pulp is better than 

 that of red fir, though 

 not as good as that 

 of balsam. White-fir 

 pulp is rather soft. The yield is approximately 2,000 pounds (bone 

 dry) per hundred cubic feet of solid rossed wood, or about 400 pounds 

 less than white spruce. 



Alpine fir yields a very good quality of pulp, which in color is as 

 light as, if not lighter than, spruce pulp. It can be ground with a 



Fig. 26.— Alpine fir (Abies lasiocarpa). 



