Jan.] THE HOT-HOUSE. «, ; ; 



with a separate range of flues; in either case you may form them 

 wholly on the outside, or part outside and part running through 

 the wall. 



This furnace is to be made large or small according to the kind 

 of fuel intended to be used, and the number of returns of the Hue-, 

 inside; for when there are but few returns, a greater quantity of lire 

 will be necessary to keep a sufficient heat. If the returns are fre- 

 quent, and wood is to be the fuel, the furnace is to be made only 

 three feet deep, to receive wood two and a half feet long or better; 

 but if the flues run only once round with no returns, the depth must 

 be Ave feet to receive four feet wood, especially if the house be 

 large; in either case the furnace is to be made eighteen inches 

 wide at bottom, the sides sloping outward to the height of twenty 

 inches, where it is to be twenty-two inches wide, covered from thence 

 by an arch, the top of which is to be two feet from the grate, which 

 is to be made of iron bars, and one half of the depth of the furnace; 

 the brick for the furnace should be laid in good well-worked brick 

 clay (not in mortar), which, when burned by the tire, will cement 

 so as to become a solid mass; this must have an iron barred grate 

 one-half of the depth of the furnace, as before observed, the re- 

 mainder of the depth to be made solid with brick, having an ash- 

 hole underneath, with a close-shutting door to it. The furnace must 

 also have an iron door placed in an iron frame, which door must be 

 furnished near the lower part with another small door, for the 

 admission of air to the fires, both having latches, so as to shut close 

 occasionally; observing that this door is not to be wider than what 

 is necessary for the admission of the firewood. Having both your 

 ash-hole and furnace thus provided with close shutting doors, you 

 may manage your fires to great advantage, by closing them up 

 occasionally from too great a current of air, especially when burned 

 clear, which would carry oft' the heat through the flues too rapidly. 

 If you intend to burn stone coal, the furnace need not be so large, 

 but the grate must run the whole depth. 



Having finished the furnace, proceed to carry up the walls, ob- 

 serving particularly to leave a scarcement a foot wide in both end 

 walls, immediately opposite where the back wall flues are to be 

 erected, from the level of the lowest flue to the top of the highest, 

 bv which means you can open the ends of the flues and clean them 

 when necessary, either by running in scrapers on the ends ol long 

 poles, or hauling any kind of small brush wood through them, by 

 meansof a line, from one end to the other; these scarcements may 

 either be made up with brick from time to time, or with sashes and 

 shutters, which will be more convenient. Whenever there art- 

 returned flues, one above the other, similar contrivances will be 

 found useful; but where there is only one running flue, a top tile 

 may be taken oft" at convenient distances, by which means it can 

 be cleaned. 



NVhen the walls are finished, then begin to erect the flues along 

 the inside walls; but, as before mentioned, it would be advisable t<> 

 have them detached therefrom two or three inches, that, by being 

 thus apart, the whole heat may arise from both sides of the said 



