76 
BULLETIN 1298, IT.. S. DEPARTMENT OF AGRICULTURE 
A comparison of these data with the data for sound pulp shown in 
the same table indicates that only small changes were produced. 
The loss in weight in no case exceeded 2 per cent, and the increase 
in solubility in cold water, hot water, and sodium hydroxide did not 
exceed 3 per cent, 3.5 per cent, and 6.5 per cent, respectively. In 
only one case was the loss in cellulose greater than 4 per cent. The 
slow rate of deterioration is evident from the typical set of curves, 
Figure 4. The 10 per cent loss in the case of Papulospora nigra is not 
excessive nor indicative of far-reaching decomposition; it approaches 
60 
Ce//u/ose 
, 
I' so 
^ 
1 40 
^ 30 
t.i 
V 
v/7 
% 
O 
\ 
6 
Aj ZO 
■jh 
One 
pen cent Soc/ium Hydnoxidi 
i 
| 
A 10 
Cc 
•>/d Wa-ren So/ub/e 
H 
D+ 
\\ 
'a :■ 
<-e 
*-) 
Sc 
\/u 
bt 
e 
f— 4 
» ■■ 
v> 
Vr 
4< 
V 
^^ 
/2 
Time — months 
Fig. 4.— Graphs showing analytical constants of ground-wood pulp infected with a mold culture, No. 
10918-6 
in value, however, some of the losses due to some wood destroyers, 
which is to be expected since Papulospora nigra is closely related to 
the hymenomycetes. 
EFFECT OF WOOD-DESTROYING FUNGI 
That the action of wood-destroying fungi on the chemical compo- 
nents of ground-wood pulp is more vigorous then that of molds, 
will be seen from a study of Table IS in which are set forth the chemical 
data for one sound ground-wood pulp, and ground-wood pulps 
inoculated with 21 of these fungi. 
