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 tzda) 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 (Lariz 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. 
