i 54 
TIMBER AND TIMBER TREES. [chap. 
strain, or by a crushing force in the direction of its fibres. 
Tried by the latter process, it exhibits a peculiarity 
unshared, I believe, by any other timber except Sabicu. 
It bears the addition of weight after weight without 
showing any signs of yielding ; and, when the crushing 
force is obtained, it gives way suddenly and completely, 
with a loud report, nothing being left of the pieces but a 
loose mass of shapeless fibres. 
The Greenheart timber is not usually hewn in the 
perfect manner that Teak, Mahogany, and many other 
woods are when prepared for shipment to the markets of 
this country, but comes from Demerara only partially 
dressed, a great deal of wane being left upon the angles. 
The butts are also almost invariably left with the snapped 
ends, as prepared for drawing out of the forest, instead 
of being cut off square. Its form should therefore be 
considered with the price quoted per load, as it will not 
compare favourably with well-squared timber. 
Table LXXIIL— Greenheart (Demerara). 
Transverse Experiments. 
Number 
of the 
specimen. 
With the 
apparatus 
weighing 
390 lbs. 
Deflections. 
After the 
weight 
was 
removed. 
At 
the crisis 
of 
breaking. 
Total 
weight 
required 
to break 
each 
piece. 
Specific 
gravity. 
Weight 
reduced 
to 
specific 
gravity 
1000. 
Weight 
required 
to break 
1 square 
inch. 
Inches. 
Inch. 
Inches. 
lbs. 
lbs. 
I 
2-15 
•°5 
5 ‘°° 
1.235 
Il8o 
1047 
308-75 
2 
2 'OO 
•OO 
475 
1,656 
1193 
1388 
414-00 
3 
2-25 
•15 
4'6o 
1,305 
IO79 
1209 
326-25 
4 
2 ’OO 
•00 
5-00 
1,212 
1152 
1052 
303-00 
5 
2-25 
•15 
4 T 5 
1,258 
1172 
1073 
3 H '50 
6 
2-25 
•05 
4‘ 2 5 
1,329 
1122 
1184 
332-25 
Total . 
12-90 
•40 
2775 
7,995 
6898 
6953 
1998-75 
Average 
2-15 
•066 
4-625 
r, 332-5 
1149 -61158-8 
333‘ 12 5 
Remarks. —Nos. i, 2, 3, and 6 broke with splintery fractures, 12 to 15 inches in length ; 
4 and 5 with similar fractures, but only 10 to 12 inches in length. 
