1918] | 
ZELLER—STRENGTH AND DURABILITY OF PINE 111 
Louisiana, and the shortleaf pine from the Missouri Land and 
Lumber Company, West Eminence, Missouri. All of the 
samples were 4X 4 inches, and each was sawed into two pieces, 
one of which was sent to the Laboratory for Testing Ma- 
terials at Purdue University, and the other one retained for 
use in the preparation of culture blocks. The shortleaf pine 
samples were numbers 46-57, and the longleaf pine, 58-69, 
the cross-sections being shown in plates 7 and 8, respectively. 
The same methods of labeling culture blocks, kiln-drying, 
taking volumes, etc., were used here as were previously re- 
ported.! In this work the culture blocks were 1X12 inches. 
Four columns, A, B, C, and D, of five blocks each were used. 
The position of these in the original samples is shown in 
the plates. 
The culture blocks were placed on end in wide-mouthed 
quart jars containing about one inch of pine sawdust. Then 
sawdust was loosely packed around the blocks and moistened 
with distilled water. The jars were plugged and sterilized 
as usual, and then the cultures were inoculated with Lenzites 
saepiaria. In this condition they were incubated for 6 
months at room temperature. After this time it was appar- 
ent that they were not doing as well as in previous experi- 
ments where the blocks were not placed in sawdust, and the 
blocks were therefore removed, piled loosely in a clean pine 
box, and each layer inoculated anew with Leneites saepiaria 
grown on pine sawdust. The whole was covered with a layer 
of damp sawdust which was slightly moistened from time to 
time. This box was stored in a humid rotting-pit for one 
year, making a total incubation period of 18 months. After 
this the blocks were removed, dried and weighed, and the per- 
centage loss in weight during incubation is the index of decay 
used in plotting the curves shown in figs. 1, 2, and 3. 
STRENGTH Тевтв 
A portion from each of the original samples was tested for 
strength at the Laboratory for Testing Materials,. Purdue 
University. One specimen 6 inches in length from each 4 4- 
1 Zeller, S. M. Loc. cit. p. 102. 
