4 
SIFTING. 
North America, with showy white, 
pink, or yellow flowers, which they 
produce in great abundance. They 
are grown in loam and peat, and 
generally ripen seeds; by which, 
and by cuttings, they are readily 
increased. 
SrpERO'xyLon.— Sapotee.—lron- 
wood. Half-hardy and _ hardy 
shrubs, and low trees, natives of 
America, the East Indies, and the 
Cape of Good Hope. Some of the 
species have been removed to Bu- 
melia, and one species, a native of 
Morocco, which is hardy in Bri- 
tish gardens, is now called Arga- 
nia. All the kinds should be grown 
in loam and peat; and they have 
all small white, or whitish-green | nial plants, natives of North America, 
flowers. 
SmE-SADDLE FLowEr.—See Sar- 
RACE NIA. 
SIEVES are necessary in gardening 
to separate the stones and coarser 
particles from the mould to be used 
for potting, and also for cleaning 
seeds. Garden 
ould be made with deep wooden 
s, but for seeds the wooden rim 
be more shallow; in both cases 
the wires, or toile m<tallique, through 
which the mould is to pass, should 
be firmly attached to the rim, the 
holes or interstices not being more 
than the fourth of an inch in 
diameter. 
SirTinG is the operation of passing 
any kind of soil through a sieve or 
screen to deprive it of its coarser 
particles. Decayed leaves and rotten 
dung are also sifted; as it is only 
the fine mould that falls from them 
that is useful in yegetation. Sifting, 
however, s be used with cau- 
tion ; as some plants thrive better 
when the particles of soil are not 
too fine. ‘Turfy loam, for example, 
should generally be chopped small 
with a spade or trowel, and not sift- 
ed; and peat should not be deprived 
of the vegetable fibre in which it 
abounds. Sifted e 
sieves for meuld | 
376 SINGLE —# ~~ 
loamy nature, is very apt to cake 
_ together and to become impenetrable 
to the finer roots of plants. e 
Site‘nE.— Silendcee, or Caryo- 
_phyllacee.—The Catchfly. Well- 
| known annual and perennial plants, 
many of which are natives of Bri- 
those of the pink. They are near 
_ all quite hardy, and only require the 
/common treatment of their respective 
kinds. Lobel’s Catchfly (S. Arméria) 
is a common garden annual that re- 
"quires sowing in the open ground in 
| March or April. 
| Six tree.—Acdcia Julibrissin. 
|; —See Aca'cia. 
| Si'Lputum.—Composite.—Peren- 
| with yellow flowers, which are quite 
_hardy in British gardens, and will 
| grow in any garden soil. 
| Srmaru‘sa.-Simarubidcee.—The 
false Quassia. Stove plants with 
showy flowers, natives of the West 
Indies, nearly allied to the Quassia. 
SINGLE TREES AND SINGLE SHRUBS 
are the grand sources of variety in 
a lawn or park, where the surface is 
fiat and without any other resources ; 
and they are also, when judiciously 
disposed, valuable additions to a sur- 
face naturally varied by undulations. 
‘fhe great art in putting down single 
trees 1s, todispose them so as to form 
groups when seen from a distance, 
and yet so as to produce variety 
in every change of position in the 
spectator when mear. The kinds of 
trees and shrubs may be varied at 
pleasure, provided some attention be 
paid to the general forms, and to the 
_prevalence of one general form or 
racter of tree or shrub in one 
e. For example, if conical 
trees be distributed equally over the 
grounds, along with round-headed 
trees, they will produce great same- 
ness ; but if conical trees prevail 
in one place, round-headed trees in 
another, and flat-spreading trees in 
when of a’ a third, so many distinct characters 
* | 
a 
° 
jam 
tain, with flowers something — 
