144 THE FLOWER GARDEN COMPANION. 



green-house of this dimension is the best general criterion for 

 one furnace; therefore the length will depend on circum- 

 stances. The front and end walls should be of brick, and 

 may be raised two feet above the surface of the earth ; on the 

 front wall, upright sashes, from two and a half to three feet 

 high, must be conveniently fixed so as to give air, either by 

 sliding into a grooved chase, so that the whole or any portion 

 of them can be taken out at either end, and air given if re- 

 quired, at any part of the front of the house; or they may be 

 suspended on hinges, to be lifted up at pleasure. The back 

 wall must be carried to such a height, that when the roof, 

 which must be glass, is put on, it will form an angle of forty 

 degrees ; the ends, which should also be glass, will have a 

 pitch accordingly ; the roof should be composed of sashes 

 four feet wide, the top ones to slide by pulleys and reels over 

 the bottom. The rafters may be four inches wide on the 

 outside, and bevelled to an angle inside ; the panes should 

 be five by seven inches, well glazed, with a lap of not more 

 than a quarter of an inch ; the wood, and all other materials, 

 require to be of the best quality. 



AKT. 2. Mode of Heating. 



The house may be heated either by a dry flue or hot water, 

 but the dry flue is most general, and perhaps best. 



Materials for the flue. The materials are, about fifty fire 

 bricks, for an arch over the furnace, six bars of cast iron for 

 the grate, eighteen inches long, the ends of which must be 

 three inches square, and the other part two inches thick, and 

 three-fourths of an inch wide at the top, and half an inch at 

 the bottom, which will allow a sufficient draught and room 

 for the ashes to pass through. 



The two frames required for the furnace and ash-hole 

 should be the same in size, twelve inches square, and from 

 two to three inches wide, with iron doors, hung in the usual 

 way: next, are two iron bars, as supporters for the grate, 

 which must be two feet long; the other materials are flue 



