42 THE FRUIT GARDEN. [Jaw. 
sorts as before noticed, next the back wall, two or three yards asun- 
der, the others in rows from back to front, at six or eight feet dis- 
tance, the tallest behind and the lowest in front, at three or four feet 
distance in each row, making each row range against the intervals 
of the trained trees behind; or if they are all standards, and half 
standards, there will be more room for several sorts of smaller 
plants under them; and as their branches will be nearer the top 
glasses, it may be of particular advantage; and in the intervals may 
be planted some low currants, gooseberries, raspberries, straw- 
berries, dwarf-beans, kidney-beans, &c. But a frame of these 
dimensions is sometimes planted entirely with standards, more 
particularly cherries, as being more moderate shooters and soonest 
arrive to a bearing state, so as to bear any tolerable quantity of 
fruit; planting them five or six feet distance: sometimes standard 
pMms, apricots, peaches, and nectarines are also planted, and vines 
to train up under the glasses. 
A frame of these dimensions, twenty-five feet long, may be 
worked by one fire; but if more than thirty feet in length, two 
furnaces for fires, with each its set of flues, will be necessary. 
With respect to the age of trees for both the above kinds of 
fire-heat forcing-frames, they should be from three to four or five 
years old, with regular heads of branches, two or three feet extent, 
and just arrived at a tolerable bearing state; no very vigorous shoot- 
ers must be admitted, but such only as assume a moderate, regular 
growth, and are trained in the nursery until they have acquired a 
proper size, each as directed under its respective head, whether as 
wall trees or standards; they are to be transplanted into the frame 
in October or November to remain for forcing; but should be per- 
mitted to have a year or two's growth here before you begin forcing 
them, that they may be firmly rooted; during which time all the 
glasses should be entirely away, that the trees may have the full air 
till forcing time is nearly arrived; or may occasionally have trained 
bearing trees of small sizes in pots, if they have been in good 
growth for one season at least, and so removed in their said pots 
into the frame at the proper season as above. 
In both the above kinds of forcing-frames, you may also plant 
some grape-vines on the outside of the front glasses in the full 
ground, and their stems trained through holes, and conduct the 
shoots along up the inside towards the glass-work to a sort of slight 
trellis, keeping the branches quite thin; and they will ripen early 
fruit, in great perfection. 
The season for beginning to make the fires for forcing the trees 
in either of the above described fire-heat frames, is any time in 
January, though about the middle, or towards the latter end of that 
month, or beginning of February, is, for the general part, rather the 
most successful time to begin the general forcing to have a good 
crop; for if the trees are forced very early, there will be some 
danger of their miscarrying; as, if they should come into blossom 
when severe weather prevails, that air cannot be freely admitted 
at intervals, they seldom set any tolerable crop of fruit; therefore, 
