120 
Deciduous Shrubs. In pursuing our subject in a con- 
secutive order, we now come to tlie acceleration or forcing of 
shrubs in general; such as the various American Azalias, the 
Moss and Cabbage Rose, the Persian Lilac, the Sweet Briar, 
and a variety of others. Such will probably continue in request 
for many years to come, notwithstanding the introduction of no- 
velties, some of which being naturally winter or spring flowerers, 
are a great disideratum in horticulture ; still, we would not that 
such pets as the old Moss Rose should be supplanted. 
Most of these shrubs, like the bulbs we before spoke about, 
organize their blossom buds in the preceding summer, and only 
await a gradual excitement, by means of heat, after a period of 
rest. During the first stages of their excitement, or acceler- 
ation, the primum mobile of successful culture must be sought 
in what is termed bottom heat. Now, although a very moder- 
ate amount may be permitted, especially during the earlier 
stages of acceleration, yet that amount must be some degrees 
in advance of the atmospheric warmth. Persons inexperienced 
in gardening affairs, will naturally ask what this amount of 
bottom heat is, on which so much depends; and before we 
conclude our advice about deciduous shrubs, we will endeavour 
to inform them. 
A bottom heat, then, being provided, for which the ordinary 
brick pits, before alluded to, will be admirably adapted, these 
shrubs will be quite at home in the opaque protectors, until 
their leaves begin to unfold, when light becomes absolutely 
essential ; and all they need will be a removal to a glazed 
protector, which, of course, must have a similar bottom heat 
provided. 
It must not here be inferred that we intend giving the amateur 
the trouble of making up a fresh pit or division, every time a 
group of plants needs a transfer, from the opaque to the glazed 
protectors. Our prime object, if we can succeed in perspicu- 
ously detining our views, is to induce the amateur to keep one, 
two, or more of such protectors, both glazed and opaque, always 
provided with a bottom heat; either by fermenting material, or 
what would be by far more systematic, (and indeed economical 
in the end) a permanent bottom heat from hot water piping. 
Such being the case, the opaque and glazed protectors would 
be continually providing for and assisting, each other; and. 
