Growing Canadian Poplars upon Waste Lands, 109 
Taking my own trees, after twenty-one years’ planting, that 
were left standing about six to the acre, or about 30 ft. apart, 
these measured 18 to 20 in. diameter for about 10 ft. of butt. 
weighing about 12 ewt. each, or equal to 3600 tons. This, if 
taken for 1000 acres, would be enough, allowing for continuous 
growth for four years’ supply, in the interval of which other trees 
would be coming on, or other timber, oak or ash, might have 
been planted advantageously for profit, and new land acquired to 
continue the supply of poplars for the mill. 
If the land were resold it would fetch about cost value, to buy 
.new land. With a moderate amount of water-power, if this 
power were not sufficient to work the mill during the summer- 
time, the top wood of the trees would supply supplementary 
power if this were burnt in a suitable wood-burning boiler, such 
as are commonly in use in the United States of America. If 
part of the land were very wet, willow might be grown, forming 
an excellent material for tough paper. There is no doubt other 
commercial products would be derived from the same lands upon 
which the poplars were grown. 
E 2 
