50 
THE FLORIST’S JOURNAL. 
of mushrooms or rhubarb, &c., being cultivated with facility. 
The admission of air would be provided for by apertures through 
the front wall, communicating with the upper part of the tank 
above the level of the water ; from thence small tubes would rise 
at intervals through the soil into the house, and this might be 
opened or closed at pleasure; the outer orifice would be pro¬ 
vided with small sliding shutters, to exclude the external air 
when not required. By this arrangement the cold air would 
pass over the surface of the heated water, and become not only 
warmed in its progress, but also supplied with an amount of 
moisture proportionate to its rarefaction, and the evil resulting 
from the admission of cold dry air will thus be altogether pre¬ 
vented. 
The plants would be trained on a trellis placed about 15 inches 
from the glass, and their roots would be confined to certain por¬ 
tions of soil, which would from time to time be replenished. 
This might easily be accomplished by various arrangements ; a 
few slates placed about each plant would serve as one simple 
means of effecting it. Transverse divisions would be introduced 
so as to allow of the removal and renewal of a plant and its soil 
without disturbing its neighbours ; a complete succession might 
thus be effected. The structure itself would exteriorly be covered 
with shutters of light frame-work, covered with painted or 
tarred canvass. These would be kept about six inches from the 
glass, and thus a cavity would be formed, the air contained in 
which would serve to prevent that incessant drain upon the 
temperature of the house which takes place either when the 
covering is in contact with the glass, or when altogether absent. 
Next in importance and usefulness to a house such as I de¬ 
scribed, I would recommend a pit heated in a similar manner, 
as being equally suited to accomplish the end in view, though 
somewhat less convenient in its application to practice. The 
principal difference between the house already referred to and 
such a pit would be the omission of the pathway at the back; 
and that the tank would occupy the whole width of the pit, ex¬ 
cept, perhaps, a cavity of six inches on either side, or else 
(which would be equally effectual) the improvement already 
described in this work might be adopted. The plants would be 
trained on a trellis near the glass, and be grown in shallow beds 
of soil above the tank. 
Planting . — I may here take occasion to mention that a small 
