88 
Mycologia 
TABLE V 
Durability of Sapwood after 12 Months’ Test 
[An asterisk (*) denotes that the blocks became too wet for a fair test.l 
Kind of Wood 
Flask 
Oven- Dry 
Weight (Grams) 
Loss 
Remarks 
No. 
Before 
Test 
After 
Test 
Grams 
Per 
Cent. 
Eastern hemlock 
3 
7.40 
2.39 
5. 01 
67.7 
Friable when dry. 
Mountain hemlock .... 
3 
8.08 
2.47 
5-6 i 
69.4 
Friable when dry. 
Western hemlock 
6 
7-9S 
2.41 
S-S4 
69.7 
Friable when dry. 
Engelmann spruce 
6 
6.91 
2.20 
4.71 
68.2 
Friable when dry. 
Sitka spruce 
6 
5-84 
1.84 
4.00 
68.5 
Friable when dry. 
Red spruce 
6 
6.21 
2,00 
4.21 
67.8 
Friable when dry. 
White spruce 
6 
7.26 
1.78 
5-48 
7S-S 
Friable when dry. 
Alpine fir 
6 
5-95 
2.0s 
3-90 
65-5 
Friable when dry. 
Grand fir 
6 
6.58 
2.52 
4.06 
61.7 
Friable w'hen dry. 
Grand fir 
6 
6.37 
1-93 
4.44 
69.7 
Friable when dry. 
Noble fir 
6 
6.52 
2.04 
4.48 
68.7 
Friable when dry. 
Douglas fir 
9 
7-52 
2.37 
5-iS 
68.5 
Fiiable when dry. 
European larch 
6 
7.16 
2. II 
5-OS 
70.5 
Friable when dry. 
Western yellow pine . . . 
3 
8.18 
2.38 
5-8o 
70.9 
Friable when dry. 
Lodgepole pine 
3 
7.13 
2.30 
483 
67.7 
Friable when dry. 
Longleaf pine 
9 
8.13 
2.49 
5-64 
69.4 
Friable when dry. 
Shortleaf pine 
9 
9-57 
3-00 
6.57 
68.7 
Friable when dry. 
Table mountain pine. . . 
3 
8.00 
2.40 
5.60 
70.0 
Friable when dry. 
Pitch pine 
3 
9.60 
2.7s 
6.85 
71-4 
Friable when dry. 
White pine 
3 
4-75 
1.47 
328 
69.1 
Friable when dry. 
Sugar pine 
3 
S.18 
1.67 
3-51 
67.8 
Friable when dry. 
Western white pine. . . . 
3 
8.18 
3-iS 
S-03 
61.5 
Friable when dry. 
White cedar 
9 
6.63 
6.12 
0.51 
7-7* 
Slightly rotted— two- 
fifths heart. 
Western red cedar 
9 
4.76 
30s 
1. 71 
35-9* 
Seriously rotted at 
ends. 
Port Orford cedar 
9 
6.93 
2.30 
4-63 
66.8 
Friable when dr.v. 
California juniper 
9 
9-30 
5-78 
3-52 
37-9* 
Well rotted at ends. 
Western juniper 
9 
7.21 
6.00 
1. 21 
16.8* 
Considerably rotted. 
Bigtree 
9 
8.38 
3.10 
5.28 
63.0 
Friable when dry. 
hemlock culture blocks were for the most part thoroughly rotted 
except as they were too wet, particularly in the bottom of the 
flasks in contact with the wet cotton. 
For the sapwood of 19 species which were in good condition for 
decay we find an average loss of 24.4 per cent, in 4 months. The 
average for hemlocks, spruces, and firs (including Douglas fir) 
was 24.9 per cent. It is thus seen that very little difference exists 
in the durability of the sapwood of the species tested. An average 
for the corresponding heartwoods is of no value, on account of the 
wide differences shown, except for hemlocks, spruces and firs, 
which average 34.8 per cent. loss. The apparent difference in 
resistance of heartwood and sapwood in these latter genera, is 
