98 TREES AND TREE-PLANTING. 
year to the place it is to occupy permanently. A nur- 
sery of young trees should be carefully weeded and cul-. 
tivated until they have arrived at such height as to ren- 
der them safe from the encroachment of weeds. 
SHELLBARK HICKORY. 
This is a lofty tree, reaching to the height of eighty 
feet, with a diameter of two feet; the trunk is of the 
same diameter and without limbs for the greater portion 
of its height. This tree is noted for the exfoliation of 
the outer bark, which is divided into long, narrow, scale- 
like plates, adhering by only one end or the middle. It 
has been found that those trees that have been trans- 
planted bear the best fruit, while those that have not 
make the best timber. This tree merits cultivation 
more than any tree of its species, both for fuel, timber, 
and its fruit, which, to my taste, is much superior to the 
walnut. 
THICK SHELLBARK HICKORY. 
This tree bears a slightly flattened, thick - shelled, 
strongly-pointed nut, with a light, apple-green hull. It is 
a very tall tree, and is sometimes mixed with the shell- 
bark hickory on account of their both having the same 
general characteristics. The leaves are the same color, 
and are veined alike, but differ in being composed of 
seven, and sometimes nine, leaflets, while the leaves of 
the shellbark hickory are invariably composed of five. 
The kernel has a very poor flavor, and is enclosed in a 
thick, hard shell of a light orange color. 
PIGNUT HICKORY. 
This is a large tree, growing to the height of eighty 
feet, and about four feet in diameter. It is found in its 
greatest abundance east of the Alleghanies. It is not 
at all common in our Western States. It is called the 
toughest of the whole hickory genus, and is used where 
toughness and durability are most needed. The nut is 
