STRUCTURE OF WOOD; &C. 
Wei 
igh t. 
Species of Wood. 
On being with- 
After exposure 
fur v i hours, in a 
drawn from the 
roAiti i' Ji ! Pi'll- 
stove. 
1 u l Ci > Cl.i" 
peraiure of 46 F. 
Italian poplar 
3-58 grs. 
4 45 grs. 
Lime-tree, seasoned, and fit | 
for the joiner’s use. J 
5 28 
640 
Lime-tree, green- wood 
539 
647 
Beech 
702 
862 
Birch. 
441 
547 
Fir 
541 
6 56 
Elm. 
5-87 
7‘l6 
Oak 
646 
7‘9 3 
Maple. 
4 76 
5'85 
Hence it appears* that 100 parts of the wopd, after 24 hoars' 
exposure in the large room, were composed of drv-wood and 
water in the following proportions : 
100 parts of 
Seer-wood. 
Walter. 
Poplar 
. .. 80 55 
.. 19*55 
Lime-tree, seasoned. .. 
. . . 82*50 
— ■■ ■ . — orppn 
83*31 
16 6 q 
j giccii, • • •• • 
Beech 
. .. 81*44 
Birch 
. . 19*38 
Fir 
. .. 82*47 
. . 17*53 
Elm .... 
. . 17*20 
Oak 
, 83*36 
Maple 
I suffered all these woods to remain in the large room during 
eight days, but their weight was very little augmented ; and as 
often as the temperature of the air of the room was raised 
above 46 F. they lost weight. So that the above may be con- 
sidered as their habitual state of dryness during the winter, in 
our climate. 
To ascertain the quantity of moisture habitually retained by 
these woods in the summer, I made the following experi- 
ments. 
Thin shavings of the species of woods mentioned below, half 
an inch broad, were thoroughly dried in the stove, and then 
exposed for twenty-four hours, in a room with a northern 
aspect 
