XIX.] 



CANADA. ROCK ELM. 



179 



pruning or from accidental causes, being extremely 

 rare. 



Large quantities 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 used to take about 600 to 700 loads annually 

 for the use of the royal dockyards, stipulating in their 

 contracts that it should be of the first quality, from 1 1 

 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, one of the slowest in fact with which we have to 

 deal ; it makes only one inch of wood diameter in about 

 fourteen years.* 



Table LV.— Rock Elm (Canada). 

 Transverse Experiments. 



Remarks. — All fractured and crippled, but not completely broken asunder. 



* See Tabular Statement in Chapter II. , on the comparative rate of growth 

 of trees, p. 45. 



N 2 



