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 733:755. Thus the outside is 
as before, the strongest. 
The mean of Tables CLIII. and CLVI., 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. 
TasLeE CLVIII. 
Tensile Experiments. 
Number . . e Weight the | Direct cohe- 
Dimensions of Specific . * 
f th * a brok 
saeumien: each piece. gravity. Park, ‘ square inch: 
Inches. Ibs. Ibs, 
31 693 16,800 4,200 
32 630 17,640 4,410 
33 651 19,320 4,830 
34 2230 620 17,920 4,480 
35 662 19,600 4,900 
30 698 20,720 5,180 
Total. . a 3954 112,000 | 28,000 
Average . see 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 oni 
r square 
Tons. | Tons. | Tons. | Tons. | Tons. | Tons. Tons. | Tons. inch. 
10°875| 11°125| 11°5 | 11°625 | 12°00 }12°125| 69°25 | 11°542| 2°885 
