PLATE XXIII. 
Contains several hints for improvements. At A, a manner of hanging the head lights is shewn, 
by which the ventilating of the Stove is greatly facilitated ; a line is fixed to the centre of the sash, 
(fig. i.) and carried over two small pullies in the head of the wall, into a groove at the back, (closed 
with single bricks, to be removed occasionally) where a weight is suspended from it, which should be 
heavier, than what is sufficient to overcome the weight and friction of the sash ; that when raised, it may 
not be shaken down by high winds : to the under part of the side rail of it, is fixed a rack, (fig. 2.) 
and to the rafter under it, a spring latch : to give air, the sash is pulled down (by catching its bar 
with a hook fastened purposely on the head of a rod) and the latch, catching the teeth of the rack, 
prevents it from ascending : to shut the stove up, the latch is pulled down, by its button, and the 
sash ascends of itself on its rollers. 
As the external application of shutters, &c. to the glass roofs of Green Houses, is attended with 
much inconvenience, and when done not perfectly safe ; at B, and the longitudinal section under¬ 
neath it, is shewn a manner of effectually protecting the plants, attended with little trouble, when 
once fixed.' At g, g, in the section are seen cavities the entire length of the end walls, capable 
of containing (without touching its sides), ten, fifteen, or twenty yards of painted canvas (as 
the length of the house may require) rolled round a long roller of wood, which turns on its 
ends, from which weights are suspended by cords, (as shewn) the outside edge of the canvas is 
attached to a slip of w r ood, as long as the house is wide, with a small roller at each end (as seen in 
the groove, above the cornice in B), its thickness an inch, and width two and a half, the nose of the 
* No vines are supposed planted in this house, but it can be applied even where there are. 
