124 FOREST TREES. 
4. Populus grandidentata—Large Aspen. 
Leaves, roundish-ovate, sinuately toothed with 
large, unequal teeth, very downy when young, after- 
wards smooth on both sides. 
This tree grows in the same localities as the pre- 
ceding, but is of larger size and more rapid growth. 
It is easily distinguished by its larger leaves, which 
are coarsely toothed, and covered with a white, silky 
down when they first appear. The tree is sometimes 
hewn into square timber, which is used where it can 
be kept dry. It has considerable strength, and does 
not readily spring or settle. When large enough, it 
is sawed into lumber, which is employed in the finish- 
ing of houses, and does not warp easily. This, and 
the preceding species, are used in Northern Illinois 
for making fences—the trees being cut into lengths 
of eight feet, split when of proper size, and nailed 
upon posts. If cutin June or July, and peeled, these 
rails will last twelve or fifteen years, but if the bark 
be not removed, they very speedily decay. 
5. Populus neterophylla—Downy-leaved Poplar. 
Branches, round; leaves, heart-shaped, or roundish- 
ovate, obtuse, serrate, white, woolly when young, at 
length nearly smooth, except on the veins beneath. 
This species appears to be rare in the Northern 
States. It is found in Southern Illinois, but my 
acquaintance with it is slight. It is a tree of con- 
siderable size, and does not seem to be at all valued 
for its timber where it grows. 
