44 



BULLETIN" 343;, U. S. DEPARTMENT OF AGRICULTURE. 



color jack pine is creamish or even brownish, and the pitch may cause 

 trouble on the felts, especially if the wood is not seasoned or has not 

 been ponded for a considerable period of time. The best results 

 can be obtained from pitchy woods if the trees are cut when the 

 sap is down. The yield of jack-pine pulp per hundred cubic feet 

 of solid rossed wood was about 200 pounds less than that from an 

 equal amount of white spruce. 



Loblolly pine (Pinus tseda) requires a dull stone and consequently 

 an expenditure of a large amount of power, but does not yield a 

 pulp of as good a quality as may be obtained from the other pines 



Fig. 32. — Tamarack (Larix laricina). 



tested. Although hardly suitable for news-print purposes, loblolly- 

 pine pulp could no doubt be used as a filler. Tests were made on 

 wood cut in the spring and allowed to remain in the forest until the 

 bark became loosened and on wood cut in the fall and split for fire- 

 wood. The fall-cut wood produced a creamy colored pulp, while 

 the spring-cut wood gave one of a brownish shade. Practically no 

 other difference was noted in the quality. The yield from the fall- 

 cut wood was about 2,500 pounds per hundred cubic feet of rossed 

 wood, while that from the spring-cut wood was 2,400 pounds, the 

 amount in each case being proportional to the weight per cubic foot 

 of the wood. 



