558 THE COTTAGE GARDENER AND COUNTRY GENTLEMAN’S COMPANION, January 13, 1857. 
Bides of the house, in which are openings, E, leading into I by the arrows ; these drains are formed of brick on edge- 
clrains, these drains converging into a main drain, as shown I sides, and duchess slates for roof, the soil forming their 
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floor. The main drain is four feet wide and one foot deep, 
so that hy laying a brick flat and four courses high in the 
centre, and bricks on edge at the sides, two common duchess 
slates reach to form the roof, and on these is spread some 
sifted soil to make the drain air-tight; the centre brickwork 
forms a support on which in several places to build up single 
brick piers to support the iron rafters which carry the slates, 
on which rests the plunging bed, as shown in longitudinal 
section. This main drain, which should be slightly on the 
descent towards the chamber, pierces the end wall of the 
hothouse, the foundation being left out at that point, the 
end wall of the house being there carried by York flag¬ 
ging, with a centre support; and thus the means are provided 
for allowing the cold air to travel from the house to the 
chamber. The openings at E, in the hothouse at Nuffield, 
are regulated by sliding lids, made of slate, for the purpose 
of experiment; this, for practical purposes, is unnecessary, 
and in many cases it will be found very convenient to make 
the cold-air openings in the centre of the house concealed 
by some ornamental stage, the floor of the walk forming the 
roof of the cold-air main drain; or handsome ventilators 
might be inserted at once in the roof of the main drain, to 
take down the cold air. These points of detail architects 
will arrange to suit different places, the great and essential 
point being to provide a means for the cold air at the extreme 
end of the house to pass to the hot chamber. The outer 
wall of the hot chamber is built of l^-inch brickwork; this 
chamber is air-tight, as far as regards the external air, having 
two openings on the side next the house on different levels, 
the lower one to admit the cold air, the upper one to allow 
its return Avlien heated. The stove occupies the chief 
portion of the chamber, standing isolated within it, except 
at the points where the fuel is supplied and the ashes 
removed, and where the return-flue passes into the chimney. 
The area left between the wall of the stove and the wall of 
the chamber is two inches, except on the side next the hot¬ 
house, where, of course, there is a larger area to allow the 
cold air to rise and flow over the plate ; but it will probably 
be found desirable to sink the top of the stove to a level 
with the cold-air drain. The stove is formed of four walls' 
of 9-incli brickwork; the outside measure is a feet 5 inches 
long, 4 feet 4 inches wide ; the internal measure, therefore, 
3 feet 10 inches long, and 2 feet 10 inches wide. Another 
wall of the same substance is carried up between the two 
ends, but not in the centre ; it is 16 inches from the wall of 
the stove next the hothouse, and of course leaves a space of 
9 inches between itself and the farther wall. It will be seen 
I by plan that this wall and the one next the hothouse form 
