Humphrey : Durability of American Woods 
85 
TABLE II 
Durability of Heartwood after 4 Months’ Test 
[An asterisk (*) denotes that the blocks became too wet for a fair test.] 
Kind of Wood 
Flask 
Oven-Dry 
Weight (Grams) 
Loss 
Remarks 
No. 
Before 
Test 
After 
Test 
Grams 
Per 
Cent. 
Eastern hemlock 
16 
7 - 7 S 
6.12 
1.63 
21.0 
Considerably rotted. 
Mountain hemlock. . . . 
16 
8.25 
4.90 
3-35 
40.6 
Seriously rotted. 
Western hemlock 
13 
7.19 
S- 3 I 
1.88 
26.1 
Seriously rotted. 
Engelmann spiuce 
13 
7.10 
3.65 
3-45 
48.6 
Friable when dry. 
Sitka spruce 
13 
6.81 
4-43 
2.38 
34-9 
Seriously rotted. 
Red spruce 
13 
6.89 
4.80 
2.09 
30.3 
Seriously rotted. 
White spruce 
13 
6.20 
4.ri 
2.09 
33-7 
Seriously rotted. 
Alpine fir 
13 
6.22 
3-73 
2.49 
40.0 
Friable when dry. 
Grand fir 
13 
7-23 
5-04 
2.19 
30.3 
Friable when dry. 
Grand fir 
13 
5-93 
2.79 
3-14 
53-0 
Friable when dry. 
Noble fir 
13 
7-44 
511 
2.33 
31-3 
Seriously rotted. 
Douglas fir 
10 
7.12 
4-73 
2.39 
33-6 
Seriously rotted. 
European larch 
13 
7-23 
4.18 
3-05 
42.2 
Seriously rotted. 
Western yellow pine . . . 
16 
7.11 
5.84 
1.27 
17.9 
Considerably rotted. 
Lodgepole pine 
16 
6.74 
5-73 
0.99 
14.7* 
Considerably rotted. 
Longleaf pine 
10 
10.62 
10.58 
0.04 
0.4 
Sound. 
Short leaf pine 
10 
ii.Si' 
10.70 
0.81 
7.0 
Slightly rotted in 
springwood. 
Table mountain pine. . . 
16 
10.50 
10.12 
0.38 
3-6 
Slightly affected. 
Pitch pine 
16 
10.69 
10.44 
0.25 
2 . 3 “^ 
Norway pine 
16 
8.02 
8.02 
0 
0 * 
White pine 
16 
6.57 
6.50 
0.07 
1. 1* 
Sugar pine 
16 
5-95 
5-10 
0.85 
14 - 3 * 
Western white pine. . . . 
16 
7.14 
6.45 
0.69 
9.7* 
Considerably rotted. 
White cedar 
10 
5-07 
5-10 
0 
0 
Sound. 
Western red cedar 
10 
5-o6 
5-04 
0.02 
0.4* 
Port Orford cedar 
10 
7 -iS 
7.06 
0.09 
1.3* 
California juniper 
10 
9.88 
9.90 
0 
0 
Sound. 
Western juniper 
10 
6.15 
6 .H 
0.04 
0.7* 
Bigtree 
10 
8.10 
8.04 
0.06 
0.7 
Sound. 
tuated considerably with the seasonal variations, usually around 
20° C. in the winter and running up to 25 to 30° C. during the 
warm summer months. 
Eighteen flasks in all were prepared. Flasks 1,4, 7, 10, 13, and 
16 were opened and examined on May 24, 1914, four months after 
inoculation; flasks 2, 5, 8, and 14 were opened on August 4, after 
six months’ test; flasks 3, 6, 9, 15, and 18 after twelve months; 
flasks II, 12, and 17, which were remade and inoculated on March 
24, 1914, were examined on the same date the following year. 
In computing the actual period of test it should be kept in mind 
that from three to four weeks are required to get a uniform infec- 
tion after the inoculations are made. In the following tables. 
