EXPERIMENTS WITH CONIFEROUS WOODS. 
The results of a series of tests to learn something of the weight 
and absorptive power of the following eight coniferous species of 
Ohio are given in Tables III and IV: 
No. 1,—White Pine— Pinus strobus. 
No. 2,—Arbor-Vitae— Thuja occidentalis. 
No. 3,—Red Cedar— Juniperiis virginiana. 
No. 4,—Hemlock— Tsiiga caiiadeiiais. 
No. 5,—Norway or red pine— Pinus rcsinosa. 
No. 6, —Jersey or scrub pine— Pinus zdrginiana. 
No. 7,—Pitch Pine— Pinus rigida. 
No. 8,—Tamarack— Larix laricina. 
The numbers used in the tables refer to the specimens named 
above. 
The weight of the kiln-dried wood is represented by 100 per cent. 
Using this as a unit the per cent of water in the air-dried wood is 
found, also the percentage of the original weight gained in soaking. 
The woods were reduced to the same size as that recorded for the 
tests already reported, viz.: Nine inches long, three-quarters of an 
inch thick and one and one-half inches wide. 
The pieces were first weighed, then dried at a temperature of 
250 degrees F. until the weight remained constant. 
In two instances, viz.: Hemlock (No. 4) and Pitch Pine (No. 7) 
the water was all expelled in the first twenty-four hours, while in the 
case of Red Cedar (No. 5) and Tamarack (No. 8) the minimum 
weight was reached only after ninety-six hours or four days of kiln- 
drying. In all specimens the loss in weight was comparatively slight 
between the air-dried and kiln-dried woods. In the Hemlock (No. 4) 
the water was expelled with the greatest rapidity. 
The same pieces after being thoroly kiln-dried were carefully 
measured and the shrinkage in width recorded in per cent is shown 
in Table III. 
The pieces were then placed in water where they remained for 
thirty days. They were taken from the water and weighed at the 
intervals stated, and the percentage of gain in weight determined as 
given in Table III. 
Another series of tests (Table I\^) with pieces of the same di- 
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