CONTROL OF DECAY IN PULP AND PULP WOOD 
77 
Table 18. 
-Chemical analyses of ground-wood pulp deteriorated by pure cultures 
of hymenomycetes 
Sample No. 
Incu- 
bation 
period 
Organism or culture No. 
Orig- 
inal 
loss 
Cold 
water 
soluble 
Hot 
water 
soluble 
Sodium 
hy- 
droxide 
soluble 
Lignin 
Cellu- 
lose 
Sound pulp. -. 
Months 
Per cent 
0.0 
f 18.1 
{ 21.1 
I 26.3 
/ 27.1 
\ 49.4 
22.2 
\ 33.1 
I 38.6. 
J 11.5 
\ 18.9 
/ 10.3 
I 12.9 
/ 13.5 
I 19.4 
f 14.1 
I 16.5 
f 7.9 
\ 12.8 
/ 21.5 
\ 30.3 
[ 41 
\ 5.6 
I 7.6 
/ 1-4 
\ 2.3 
f 1.9 
\ 2.8 
I 3.5 
f 1.0 
\ 1.7 
2.0 
/ 8.6 
\ 13.9 
2.1 
f 3.1 
I 4.1 
2.7 
/ 3.3 
\ 5.1 
f 4.7 
\ 5.0 
0.8 
Per cent 
0.0 
4.9 
5.9 
6.4 
8.0 
7.3 
9.5 
11.1 
9.1 
3.9 
6.1 
2.8 
3.2 
4.8 
4.9 
6.0 
6.5 
4.2 
5.3 
7.5 
9.6 
2.3 
2.1 
3.6 
2.3 
1.9 
0.0 
0.6 
1.3 
0.0 
0.1 
1.5 
5.0 
5.9 
1.7 
1.1 
2.2 
1.7 
2.3 
2.7 
3.2 
2.7 
1.9 
Per cent 
1.0 
9.0 
10.5 
11.3 
13.0 
11.0 
13.7 
15.2 
13.0 
7.2 
8.9 
5.7 
5.1 
8.9 
7.9 
9.8 
10.2 
7.0 
8.5 
11.8 
15.7 
5.4 
6.0 
7.5 
4.6 
3.5 
1.6 
5.0 
4.5 
0.5 
2.4 
3.2 
7.8 
10.0 
2.9 
2.3 
3.9 
3.0 
3.6 
5.5 
5.7 
4.7 
2.1 
Per cent 
10.1 
37.8 
37.6 
38.3 
40.0 
33.4 
40.7 
41.6 
38.0 
30.9 
32.5 
29.6 
29.2 
34.9 
37.2 
33.0 
36.3 
25.5 
40.2 
41.0 
40.5 
21.0 
19.7 
21.6 
14.1 
13.8 
13.6 
14.4 
17.8 
13.0 
12.0 
13.9 
30.6 
37.2 
15.8 
14.5 
19.5 
17.1 
15.8 
22.0 
20.7 
20.8 
14.2 
Per cent 
29.7 
28.8 
28.4 
28.8 
27.7 
26.6 
30.7 
28.8 
28.5 
29.1 
29.5 
30.6 
30.7 
27.7 
32.0 
29.3 
29.0 
29.0 
34.6 
28.8 
28.6 
26.8 
27.3 
26.6 
29.4 
29.1 
28.7 
28.4 
27.7 
28.7 
29.6 
29.4 
29.3 
29.2 
28.4 
28.4 
32.0 
28.9 
28.8 
27.2 
27.4 
26.9 
29.1 
Per cent 
60.0 
26 
6 
9 
12 
6 
12 
6 
10 
12 
6 
9 
6 
9 
6 
9 
6 
9 
6 
9 
6 
9 
6 
9 
12 
6 
9 
6 
9 
12 
6 
9 
6 
6 
9 
6 
6 
9 
6 
6 
9 
6 
9 
6 
^82219-15 
35.5 
25 
33.4 
24 
J4620-2 - 
27.8 
100 
26.8 
102 . . 
1-4620-1 
10. 8 
106 
29.0 
107 
18.2 
108 
J61020-1 
16.9 
127 
40.6 
>Fomes roseus .. - 
130 
44.2 
131.. . ... 
44. 1 
148 
40.4 
149 .- ... 
J4620-3 
35. 1 
178 
38.0 
179 
J61420-7 
37.3 
152 
48.8 
150... 
\Lentinus lepideus 
38.0 
157 
32.0 
158 
[82219-4 
24. 2 
5 
56.0 
4 
54.7 
6 . 
jl02019-la 
53.4 
27 - 
56.7 
28 
< Paxillus panuoides .. 
58. 
32 
55.6 
30 
55.8 
31 
j-10918-10 - 
55.9 
49 
57.6 
50-. 
61520-1 
57.0 
133 
57.4 
136 
J61420-3 -. 
45.1 
137 .. 
Corticium galactinum 
[62220-1 
38. 3 
142 
57.2 
145 
57.7 
146 
61420-4 
56.0 
160 
55.8 
172 
J6920-1 
56.4 
173 
J4620-4 
53. 8 
175 
54.8 
176 
62020-1 
54. 6 
181 
50.5 
The large losses in weight, which with one fungus reached 27.1 per 
cent in six months and 49.5 per cent in 12 months, were reflected in the 
chemical data. The solubility in cold and hot water and in sodium 
hydroxide in practically all cases increased very substantially, and 
reached maxima of 11.1 per cent, 14.7 per cent, and 40 per cent, 
respectively. The decreases in cellulose content were also very 
marked. The reduction in one case was 10.9 per cent. 
In striking contrast with the other chemical data is the fact that 
the lignin content remained practically constant and independent of 
decay. Its variations from the value of sound pulp were not much 
greater than the experimental error. The action of the fungi investi- 
gated was, therefore, apparently selective in that it did not involve to 
any appreciable extent of decomposition of lignin. Unfortunately it 
was the cellulose, which from the paper-making standpoint is the 
most important part of the wood, which suffered the greatest deterio- 
ration. 
