XXXV.] 
PITCH PINE. 
291 
Specimens 19 to 24, with the early layers, also 25 
to 30, with the later layers of wood, were taken from a 
log of the same dimensions as the last, and under 
precisely the same conditions as those referred to in 
Tables CLIV. and CLV., the results being nearly as 
before; that is, specimen 20, or the second piece from 
the butt-end of the early growth, and specimen 25, or 
the butt length of the later growth, are the two strongest 
pieces of the respective series. We also see in the mean 
results of the experiments that the strength of the inner 
is to the outer wood as 733 1755. Thus the outside is 
as before, the strongest. 
The mean of Tables CLIII. and CLVL, with early layers or inner wood, 
E== 711945. S = 2130. 
The mean of Tables CLV. and CLVII., with later layers or outer wood, 
E — 763800. S = 2264. 
Table CLVIII. 
Tensile Experiments. 
Number 
of the 
specimen. 
Dimensions of 
each piece. 
Specific 
gravity. 
■Weight the 
pieces broke 
with. 
Direct cohe¬ 
sion on 1 
square inch. 
Inches. 
lbs. 
lbs. 
31 
[ 
693 
16,800 
4,200 
32 
630 
17,640 
4,410 
33 
34 
2 X 2 X 30 
651 
620 
19,320 
17,920 
4,830 
4,480 
35 
662 
19,600 
4,900 
36 
698 
20,720 
5,180 
Total. . 
3954 
112,000 
28,000 
Average . 
659 
18,666 
4,666 
Table CLIX. 
Vertical or Crushing Strain on cubes of 2 inches. 
No. 37. 
No. 38. 
No. 39. 
No. 40. 
No. 41. 
No. 42. 
Total. 
Average. 
Ditto on 
1 square 
inch. 
Tons. 
Tons. 
Tons, 
Tons. 
Tons. 
Tons. 
Tons. 
Tons. 
10-875 
II-I 25 
11 '5 
11-625 
I2'00 
12-125 
69-25 
11-542 
2-885 
