XXXI.] 
LARCHES. 
263 
Table CXL. 
Tensile Experiments. 
Number 
of the 
specimen. 
Dimensions of 
each piece. 
Specific 
gravity. 
Weight the 
piece broke 
with. 
Direct 
cohesion on 
1 square inch. 
Inches. 
lbs. 
lbs. 
7 
\ 
6l8 
14,000 
3,500 
8 
1 
645 
13.440 
3,360 
9 
/ 2 <■' 2 X ( 
647 
19.936 
4,9% 
10 
I ( 
688 
19,880 
4,970 
Total . 
2598 
67,256 
16,814 
Average . 
649 
16,814 
4,203 
Table CXLI. 
Vertical Experiments on Cubes of 
Number 
of the 
specimens. 
1 Inch. 
2 Inches. 
3 Inches. 
4 Inches. 
Crushed with 
Crushed with 
Crushed with 
Crushed with 
II — 14 
15—18 
19, 20 
21, 22 
Tons. 
2-875 
2-750 
2-875 
3’000 
Tons. 
I 0-750 
10-875 
10-750 
10-375 
Tons. 
19-625 
19-500 
Tons. 
42 75 
42-50 
_ 
Total. . 
ii*5 
42-75 
39 -I 25 
85 ‘25 
Average . 
2-875 
10-687 
19-562 
42-62 
Do. per in. 
2-875 
2-672 
2-174 
2-663 
E = 649130. S — 1643. 
North America also produces a species of Larch, the 
well-known Hackmatack (Larix Americana ); it is said to 
be tolerably abundant, and is found to range from the 
mountains of Virginia to Hudson’s Bay. 
In deep forests it sometimes attains a height of 60 and 
