XXVII. | CANADA ELM. 227 
wood for the converter to deal with, the instances of 
defects being found in opening it, arising either from 
pruning or from accidental causes, being extremely 
rare. 
About 2,500 to 3,000 loads of this wood are imported 
annually into each of the London and Liverpool markets, 
to meet the wants of ‘private dealers, who employ it for 
coach-making, turnery, boat-building, &c. ) The Govern- 
ment also take about 600 to 700 loads annually for the 
use of the royal dockyards, stipulating in their contracts 
that it shall be of the first quality, from 11 to 15 inches 
square, averaging 12% inches; 20 feet and upwards in 
length, averaging at least 24 feet in length, and to be 
well squared, and free from knots, 
The Canada Rock Elm is a remarkably slow-growing 
tree, the slowest in fact with which we have to deal; it 
makes only one inch of wood diameter in about fourteen 
years.* 
TABLE CXVII.—Rock Ei_m (CANADA). 
Transverse Experiments. 
Defiections. Total oe Weight Weight 
it is 
ae T | With the After the At segues ge i ms peauied 
specimen, Apparatus] weight | the csi | to break) 6 | specific! square 
390 lbs. | removed. | breaking. | piece. 700. 
Inches. Inch. Inches, Ibs. Ibs. 
I 1°60 25 8°55 935 | 760} 861 | 233°75 
2 185 | °30 8°75 946 | 753 | 893 | 236°50 
3 1°75 *30 9°00 899 735 | 856 | 224°75 
4 1°90 °35 8°65 918 740 | 868 | 229°50 
5 1°85 25 8°75 927 | 738 | 879 | 231°75 
6 1°55 “30 9°05 895 | 765] 819 | 223°75 
Total .| 10°50 1°75 52°75 5,520 | 4491 5176 | 1380°00 
Average; 1°75 "29 8°79 920 748 | 863] 230°00 
Remarks,—All fractured and crippled, but not completely broken d 
* See Tabular Statement in Chapter II., on the comparative rate of 
growth of trees, p. 18. 
