158 THE FORCING GARDEN. 
is easy enough to do by keeping the sets in a warm 
cellar or house a month or two before the planting 
time comes, which should be by Christmas. 
This house should be furnished with a hot-water 
apparatus; one flow-and-return pipe is all that is re- 
quired, and will be found enough to force Potatoes. 
Now if the glass comes down to the ground within one 
foot, so much the better; and if the wall is ten feet 
high at the back, the glass may reach up to the top 
with advantage. This will then be at the angle indi- 
cated in the above plan. This pitch of the angle will 
give a twelve-feet rafter, which will be a moderate 
length for Grape vines, and these would be even 
better than Peaches on the wall, because I know that 
it is not good to disturb the border much on which 
Peaches are growing ; and the manuring and cultiva- 
tion and top-cropping of the border will not at all 
injure the vines, but, on the contrary, do them good. 
As a permanent crop the vines will pay well, for as 
some fire heat must be kept on for the Potatoes, they 
will get forward some weeks before vineries with no 
fire heat. One vine will carry three rods each for 
spurring. 
Suppose, then, the whole border eight feet wide by 
any length—say two hundred feet—is planted with 
Potatoes all over as suggested, 7.e. nine inches apart, 
planting them six inches deep, then no earthing up 
will be required, so long as the ground is made very 
fine at the time of planting, and the sets are wel! 
covered with fine old leaf-mould. I do not mean that 
which is perfectly decomposed, but leaf-mould from 
leaves laid up one year, which will then be sufficiently 
decayed for the purpose, and which contains nutriment 
