90 
Mycologia 
Sapwood tests over a 12 months’ interval resulted in complete 
decay for all species (23) which were not too wet. The average 
loss for all was 68.2 per cent, and for hemlocks, spruces and firs 
TABLE VII 
Per cent. Loss in Dry Weight for the Different Test Periods 
[An asterisk (*) denotes that the blocks became too wet for a fair test.] 
Kind of Wood 
Sapwood 
Heartwood 
4 Months 
6 Months 
12 Months 
4 Months 
6 
Months 
12 
Months 
Hemlocks 
233 
— 
68.9 
29.2 
53.8 
61.7 
Spruces 
27 -S 
48.7 
69.7 
36.2 
49.8 
67.1 
Firs 
23.8 
4 I-S 
66.4 
38.9 
4 S-I 
70.1 
White pines 
21.9 
S0.8 
66.1 
— 
— 
— 
Hard pines 
25 .I 
52.4 
69.7 
— 
— 
— 
Western yellow pine. . . 
24.4 
52.5 
70.9 
17.9 
— 
55-9 
Lodgepole pine 
21.0 
46.6 
67.7 
14.7* 
— 
64.4 
Longleaf pine 
30.5 
56.1 
69.4 
0.4 
— 
5 I.I 
Pitch pine 
24-3 
14.8* 
71.4 
2.3* 
— 
10.9* 
Norway pine 
— 
— 
— 
0 * 
— 
69.4 
Shortleaf pine 
25-1 
64.7 
68.7 
7.0 
— 
20.7 
Western white pine. . . . 
17.2 
4 S-I 
61 . 5 
9.7* 
— 
32.1* 
Sugar pine 
22.9 
54-8 
67.8 
14 - 3 * 
— 
57-9 
Table mountain pine . . . 
8.7* 
41.9 
70.0 
3-6 
— 
39-6 
White pine 
25-7 
52.4 
69.1 
1 . 1* 
— 
8.8 
European larch 
10. 0* 
49.6 
70-5 
42.2 
25-5 
42.9 
Douglas fir 
26.4 
48.4 
68.5 
33-6 
— 
28.1* 
Bigtree 
2.8* 
37-5 
63.0 
0.7 
— 
3 S-r 
Port Orford cedar 
19.8 
37-9 
66.8 
1.3* 
— 
22.6* 
White cedar 
0 * 
10.7 
7.7* 
0 
— 
5 - 4 * 
Western red cedar 
2.3* 
S 9-7 
3 S- 9 * 
0.4* 
21 . 3 * 
California jun per 
28.3 
12.0* 
37 - 9 * 
0 
— 
3-3 
Western juniper 
21.7 
48.9 
16.8* 
0.7* 
— 
15.2* 
68.4 per cent. The corresponding loss in the heartwood of the 
latter genera (exclusive of Douglas fir) was 65.9 per cent. In all 
of these specimens the wood was so thoroughly rotted that it 
could be pulverized between the fingers. 
The 12 months’ test on heartwood of the remaining species 
brings out considerable differences in durability, ranging from 
3.3 per cent, loss in California juniper to 69.4 per cent, in Norway 
pine. White pine was affected but little (8.8 per cent.), while 
sugar pine was seriously rotted (57.9 per cent.). Lodgepole pine 
(64.4 per cent.) fell in the class with hemlocks, spruces and firs. 
The specimen of longleaf pine, which did not appear very highly 
resinous, did not prove as resistant (51.1 per cent.) as shortleaf 
pine (20.7 per cent.), which was of a good grade. Table mountain 
