THE SUITABILITY OF AMERICAN WOODS FOR PAPER PULP 37 
Slash Pine (Pinus caribaea, formerly, P. cubensis and P. heterophylla). 
Other names in use. — Swamp pine, bastard pine, meadow pine, pitch pine, 
spruce pine, and saltwater pine. 
Range. — Atlantic coast region (60 to 100 miles inland) from South Carolina 
to southern Florida; westward in the coast region of the Gulf States to eastern 
Louisiana. 
Oven-dry weight per cubic joot, green volume. — 37 pounds. 
Fiber length. — 
By Sulphite Process 
Probably too resinous for consideration. 
By Sulphate Process 
Reduces readily. 
Unbleached pulp: Strong; fibers rather long and coarse. 
Yields: 45 to 50 per cent of strong pulp. 
Bleach required: 20 to 30 per cent in one stage, or 10 to 20 per cent in two 
stages. 
Uses to which pulp is suited: High-grade kraft wrapping papers and fiber 
board. 
From 2 to 30 gallons of turpentine and pine oil per cord of wood may be recov- 
ered from the digester relief. 
On account of its rapid growth, the high quality of lumber obtained from it, 
its large yields of rosin, turpentine, and pine oil, and* the ease with which it reduces 
to an easy-bleaching pulp, slash pine is worthy of consideration for replanting 
areas with a view to establishing a group of industries related to each other and 
dependent on a self-perpetuating supply of wood. 
By Mechanical Process 
Probably too resinous for consideration. 
Westerx Yellow Pixe (Pinus ponderosa) 
Other names in use. — Yellow pine and bull pine. The lumber is sold under 
various trade names, including western pine, western soft pine, western white 
pine, California white pine, Oregon white pine, Washington white pine, Montana 
pine, Arizona soft pine, Arizona white pine, New Mexico white pine, Mexican 
white pine, British Columbia white pine, and pondosa pine. 
Range. — From British Columbia and the Black Hills of South Dakota south- 
ward in the Pacific andRocky Mountain region to western Texas, northwestern 
Nebraska, and Mexico. 
Oven-dry weight per cubic joot, green volume. — 24 pounds. 
Fiber length. — 3.6 mm. 
By Sulphite Process 
Reduces fairly readily but unevenly. 
I'nbleached pulp: Dark in color, and shivy. 
Yields: 45 to 50 per cent. 
Bleach required: Probably more than 20 per cent. 
Uses to which pulp is suited: Limited chiefly by dark color and content of 
pitch and shives. 
By Sulphate Process 
Reduces readily. 
Unbleached pulp: Very strong, the long, fine fibers having exceptionally good 
felting properties. 
Yields: 45 to 50 per cent. 
Bleach: Probably more than 25 per cent. 
Probably enough turpentine may be recovered from the digester relief to war- 
rant consideration. 
Uses to which pulp is suited: High-grade kraft wrapping papers and fiber 
board. 
By Mechanical Process 
Reduces fairly readily. 
Pulp: Of satisfactory color and soft texture, but coarser than spruce pulp; 
probably pitchy. 
Power required : 40 to 50 per cent more than for spruce, to obtain pulp of the 
same strength. 
Uses to which pulp is suited: Limited by coarseness and pitchiness. 
