8 THE FORCING GARDEN. 
months: these are most essential in early forcing. 
I propose that the bars for this root protection for 
vine borders should. be fixed from the front wall 20 
inches apart, and then glazed on my own plan without 
side laps or putty. (See illustration.) 
As soon as the month of May comes, take the glass 
off and put it into boxes till it is wanted again, when 
the border will be open to all the genial influences of 
the sun, as well as the refreshing rains of the summer 
months. It is but a few hours’ work for any good 
ordinary man to unglaze the whole of these border 
protectors, and to reglaze them, the ‘clips’ being 
already there. 
For those who prefer them, shifting sashes may be 
used, which may be made to slide, as in the case of 
ordinary frame sashes, but these will cost double the 
expense of making. Air can be admitted by having a 
flap shutter one foot wide all along the eaves of the 
roof of the vinery, being made to open and shut by 
cords from the inside, above the pipes. If the border 
glass is arranged on my plan, this will be found to be 
the best, there being no lattice-like cross-bars, no side 
laps, nor so much glass as in all the other patent plans 
of glazing. 
The ventilators in the wall, fig. 2, will, I have no 
doubt, be found the cheapest to construct, and the 
most convenient to work, as they can all be opened 
and shut at once, and that by a boy. A frame should 
be constructed so as to fix inside each opening in the 
wall and made to come beyond the brickwork a little, 
just enough to form a facing for the shutter, so that 
each one will fit sufficiently close to exclude the air 
and to prevent the escape of heat. The sliding shut- 
