40 THE FRUIT GARDEN. [Jan. 
forking it over to the bottom, which will revive the decaying heat 
six or eight weeks longer. 
A bark-heat forcing-frame, nearly of the above dimensions, might 
be contrived entirely for forcing fruit-trees, having a border within- 
side along the back wall, three or four feet wide: there plant young 
bearing dwarf fruit trees, of any sorts before mentioned, at six or 
eight feet distance, in the manner of wall or espalier trees, training 
them also in the same manner as directed for the respective sorts in 
their natural state of growth. The bark-pit should here be almost 
half sunk; and in the beginning of February fill the pit with new 
tan-bark, which will soon set the trees into bloom, and will ripen 
their fruit early. 
But the most eligible general forcing-frame for various sorts of 
plants, is one of the above mentioned construction, having also flues 
for fire-heat; the walls must be of brick work, having two or three 
returns of flues formed of the same materials, running the whole 
length of the back wall within, and one or two along the front and 
ends, by which to convey fire-heat occasionally in severe frosts, cold 
nights, and in all very cold and intemperate weather; which will 
be a great improvement in very early forcing, so that this kind of 
frame will be nearly of the plan of a stove or hot-house. 
In default, however, of any of the above kinds of bark-heat forc- 
ing-frames, one might be effected by a common bark-pit, made in 
any dry sheltered situation, with a brick wall, to any convenient 
size, and covered with glass-lights. This pit is to be principally 
above ground and filled with good fresh tan to the depth of four 
feet, in which you may plunge pots of roses, or any other shrubs; 
any sort of low herbaceous flowering plants, fibrous, or bulbous 
rooted; kidney-beans, strawberries, &c; observing however, that in 
severe frost, the wall of this pit must be protected by hot-dung, 
leaves, or straw, in order to prevent the frost penetrating into the 
bed, and it must be carefully covered with mats at night, and even 
in the day time in very severe weather. 
By Fire-heat — This kind of forcing-frame is worked by actual 
fire, burned in a furnace behind, at one end or middle, from thence 
communicating the heat by internal flues or funnels, running the 
whole length of the back wall in three returns, one above another, 
and continued in a flue round the front, and the frame thus con- 
structed, is often employed for ripening several of the more valua- 
ble fruit-trees at an early season; or for forwarding such to perfec- 
tion, which do not ripen freely without artificial aid. 
This frame, or forcing house, must be formed of brick-work, at 
least the back or main wall, for the convenience ol having fire and 
flues, and the whole front, &c. must be glass, like the other sorts; 
the length may be from twenty to forty feet, or more, though one 
fire will not warm more than that length; the width may be from 
five or six, to twelve or fifteen feet, and height eight or ten. It may' 
be contrived either of moderate width for one row of trees only,. 
to range against the back wall; or may be capacious enough to have 
a range of trained wall-trees behind, as just mentioned, and some 
small half standards, ranging also from the back to the front. 
