270 1HE NURSERY. [March. 
^ous and profitable. They may be sown, either in November, 
when ripe, or in March, first breaking the balls of seed, and sepa- 
rating them effectually, mixing them with some dry earth or sand, 
and then sowing them even on the surface of prepared four feet 
wide beds, in the Nursery, and covering them about a quarter of 
an inch deep, or a little better, if the earth is fine and light: coo 
deefi covering is injurious to all kinds of seeds; for nature never 
designed more than a sufficiency to promote and give action to vege- 
tation. They will come up the first season, and the next or succeed- 
ing year may be planted into nursery rows. 
The Lirioder,dron TuHpifera, or Tulip-tree, commonly, but very 
improperly, called poplar, is best propagated by seed, which should 
be sown in November when ripe, or preserved in sand or earth till 
March, and then sown, covering them half an inch deep. Those 
sown in November will all grow the spring following; but, if kept out 
of the ground, in a dry state, till spring, a great number of them 
will not vegetate till the next year. 
The Celtis occidentalisy or Nettle-tree, is propagated by seed; 
which, if sown in November when ripe, or preserved in earth or 
sand till March, and then sown, will generally vegetate the same 
season; but, if the berries are kept dry till spring, the greater 
number of them will not grow till the next year. They should be 
covered about an inch deep. 
Mafles. 
The Acer argenteum or silvery leaved, and Acer rubrum, or scar- 
let maples, perfect their seeds in May, and should be sown imme- 
diately after having been collected; they will vegetate directly, and 
produce fine plants the first season, if kept free from weeds. The 
seeds of the former do not keep well till spring, but those of the 
latter will. 
The Sugar, Canada, Ash-leaved, Pennsylvania, and Mountain 
maples, and also the Acer majus, or sycamore, may be sown either 
in autumn or March, and will succeed well in either season: if 
sown in autumn, cover them about three quarters of an inch deep; 
if in spring, half an inch will be sufficient. When about a foot high 
in the seed beds, plant them early in spring into nursery rows, at 
proper distances. 
Catalpa, Stveet-gum, Papaw, and Persimmon. 
The Bignonia Catalpa will grow freely from seed, which is to be 
preserved in the siliques or pods till March, and then sown: or it 
may be propagated either by layers or suckers. 
The Liquidamber Siyraciflua, or maple-leaved sweet-gum, grows 
freely from seed sown early in spring. 
The Aiinona triloba, or common papaw, is a hardy plant, and may 
be propagated by sowing the seeds about an inch deep, either in Oc- 
tober, November, or March. 
