80 THE GREEN-HOUSE. [JAN. 



may also have large canvas cloaths upon rollers to let clown occa- 

 sionally before the windows, or in default of such, you may nail up 

 garden mats. 



Let one third of the front side of the roof, for the whole length 

 of the house, be formed of glass-work, and the back wall raised, so- 

 as that a horizontal ceiling may be carried from the upper part of 

 these lights to it, which will cause the back half of the roof to be 

 somewhat more flat than the front. Ornamental wood-work may 

 be erected outside, along the top of those lights, to give a light ap- 

 pearance to the roof. Or, if the house be small, you may carry the 

 entire roof with a gentle slope from the front to the back wall, 

 which must be made of a proper height for that purpose ; one third 

 or one half of such roof may be made of glass-work ; from the ter- 

 mination of which, carry the ceiling on a level to the back part of 

 the house. 



The better to confine the air warmed by the sun in the day time, 

 and to prevent the cold air from rushing in on the approach of night, 

 when that within begins to cool and consequently to contract 

 in bulk ; I would advise to have all the panes in the roof-lights neat- 

 ly and closely puttied, where they overlap one another ; and to have 

 either one, two or three of those lights, in proportion to the lenghth 

 of the house, so constructed, as to slide down and up a few feet, by 

 means of pullies ; in order to give vent to the foul air generated in 

 the house, which naturally ascends to the upper part. The sized 

 glass, recommended in page 3, for hot-bed lights, is what I would 

 particularly recommend for these roof-lights, being not only the 

 strongest, but by much the cheapest. 



The windows or upright front-lights, must be made with large 

 panes of glass, Sec. to admit the more light, as well as to give a hand- 

 some appearance to the house : the upper half of each window 

 must be so contrived, as to slide down, and the lower half up, 

 occasionally, to admit air to the plants when necessary. 



If a spacious and ornamental window be placed in each end, (if 

 the house be detached) to receive the benefit of the rising and set- 

 ting sun, it will be of considerable advantage ; these particularly 

 should have good close shutters either inside or outside, and be kept 

 shut every night during the winter, and also in the day time in very 

 severe weather, except while the sun immediately shines on them. 

 If the front is so contrived, that inside shutters to the windows, can- 

 not be conveniently hung, outside sliding shutters should be made, to 

 be used only when necessity requires. 



But let it be particularly observed, that all the lights, cases, doors, 

 and wood work of the house, be made of good seasoned wood, and 

 well painted, to prevent either their swelling by wet, or shrinking 

 by drought ; that all parts be well jointed and fitted together, so as 

 to be as nearly air tight as possible. 



A house constructed on this plan, will very seldom require the 

 assistance of fire-heat, which ought always to be used with great 

 caution in a Green-house ; it will admit light, collect heat, and give 

 health, beauty and vigour to all the plants, 



