50 BULLETIN 348, U. S. DEPARTMENT OF AGRICULTURE. 
The aspen fibers (shown in Pl. V) appear to be even shorter than 
those of the birch. The steamed pulp when run into a 63-pound 
sheet gave a Mullen test of 0.51 point per pound and 6.2 points per i 
thousandth inch of thickness. 
Between the cooked and uncooked hemlock fibers (shown in Pl. VI) | 
there is more contrast in respect to length than in the case of birch — 
and poplar. The cooked hemlock when run into a 55-pound sheet | 
without sulphite gave a Mullen test of 0.51 point per pound and 6 © 
points per thousandth inch of thickness. 
Both the steamed and unsteamed jack pie (shown in PI. VID) 
are remarkably free from wood flour and short fiber. The steamed- ) 
Fig. 38.—White pine (Pinus strobus). 
wood sample, when run into a 43-pound sheet without sulphite, gave 
a Mullen test of 0.47 point per pound and 4.5 points per thousandth — 
inch of thickness. 
In Plate VIII, which shows steamed and unsteamed taitioticea 
fibers, the much greater length of the former is apparent. 
Plates DY, Vito Xe Tm XII, figure 1, show the fibers from a 
number of different ood plodntl in the natural state under the — 
same conditions. With the exception of western larch, the fibers 
are of very good quality and compare well with those of spruce. So — 
far as length and fineness go, the fibers shown in Plates VII, X, and > 
XII are fully equal to spruce. 
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