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the glasses being so high, the plants receive less 

 benetit from the sun, and are apt to draw up too 

 fast into long slender leaves and stems, as they 

 iiainrullv lend towards the glasses. Where the 

 top glasses are of a moderate distance from the 

 plants, they receive the benefit of the sun's heat 

 more fullv, which is essential in winter, and be- 

 come more stocky at bottom, and assume a 

 more robust firm growth, particularly the pme- 

 apjile, and are thereby more capable of produc- 

 jnir large fruit. 



After having determined on the dimensions 

 as to length and width, the foundations of the 

 walls should be set out accordingly of brick- 

 work, allowing due width at bottom to support 

 the flues a foot'wide, wholly on the brick bases; 

 detached an inch or two from the main walls ; 

 then setting off the back or north wall a brick 

 and a half or two bricks thick, and the front 

 and end walls Inine inches, carrying up the 

 back wall from ten to fourteen feet high; but 

 those of the front and ends only from about two 

 feet to a yard ; taking care, in cariying up the 

 walls, to allot a proper space for a door-way, at 

 one or both ends, towards the back part ; setting 

 out also the furnace orfire-plaeeof the flues in the 

 bottom foundation, towards one end of the 

 back wall behind, formed also of brick-work, 

 made to eonimunieate with the lowermost flue 

 within. But when of great length, as forty 

 i'eet or more, a fire-place at each end may be 

 necessary ; or, if more convenient, may have 

 them in the back part of the end walls, or both 

 in the middle way of the back wall ; each com- 

 municating with a separate range of flues ; in 

 either case, forming them wholly on the outside 

 of the walls, about twelve or fourteen inches 

 wide in the clear, but more in lengthways in- 

 ward ; the inner end terminating in a funnel to 

 communicate internally with the flues, fixing 

 an iron-b:'.rred grate at bottom to support the 

 fuel; calculated for coal, wood, peat, turf, he. 

 An ash-ho!e should be made underneath. The 

 mouth or fuel door should be about ten or twelve 

 inches square, having an iron frame and door 

 fixed to shut with an iron latch as close as pos- 

 sible. The whole furnace should he raised six- 

 teen or eighteen inches in the clear, finishing the 

 top archways. Then continue carrying up the 

 ■walls of the building regularly, and on the inside 

 erect the flues close along the wails. 



J lis sometimes advantageous to have the flues a 

 little detached iroui thewalls, one, two, or three 

 inches, that, by being thus dislinef, the heat 

 may arise from both sides, w hich will be an ad- 

 vantage in more elVeelually dillusmg the whole 

 beat internally in the house; as, when they are 

 attached close to the walls, a very considerable 



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portion of the heat is ineffectually lost in the 

 part of the wall behind. In contriving the flues, 

 they should be continued along the front and 

 both ends, in one range at least, in this order. 

 But it is better if they be raised as high as the 

 outward front and end walls, in one or two 

 ranges, one over the other. On the tops of 

 these mav be placed pots of many small plants, 

 both of the exotic and forcing kinds. 



Thus proceed in the constiuction of the 

 flues, making them generally about a foot wide 

 in the whole, includmg six or eight inches in 

 the clear, formed with brick-work, on edge; 

 the first lower flue should communicate with the 

 furnace or fire-placQ without, and be raised a 

 little above it, to promote the draught of heat 

 more freely, continuing it along above the in- 

 tended level of the floor of the back alley or 

 walk of the house the above width, and three 

 bricks, on edge, deep, returning it in two or 

 three ranges over one another, next the back 

 wall, and in one or tw-o along the ends, and 

 front wall, as the height may admit ; each re- 

 turn two bricks, on edge, deep, and tiled or 

 bricked over. In the beginning of the first 

 bottom flue a sliding iron regulator may be 

 fixed, to use occasionally, in admitting more or 

 less heat, being careful that the brick work of 

 each flue is closely jointed with the best sort of 

 mortar for that purpose, and well pointed with- 

 in, that no smoke may break out; having each 

 return closely covered with broad square paving 

 tiles on the brick-work; covering the upper- 

 most flues also with broad, thick, flat tiles, the 

 whole width, all veiy closely laid, and joined in 

 mortar. The uppermost or last range of flues 

 should terminate in an upright vent or chimney 

 atone end of the back wall; and where there 

 are two separate sets of flues, there should be a 

 chimney at each end. An iron slider in the 

 termination of the last flue, next the chimney, 

 may also be provided, to confine the heat more 

 or less on particular occasions. 



Sometimes, in very wide houses, in erecting 

 the flues, to make all possible advantage of the 

 fire-heat, one or more spare flues, to use occa- 

 sionally, is continued round the bark-pit, car- 

 ried up against the surrounding wall, but de- 

 tached an inch or two, to form a vacancy, tor 

 the heat to come up more beneficially, and that 

 by having vent, it may not dry the tan of the 

 bark-bed too much ; and in the beginning a 

 sliding iron regulator may be fixed, either to ad- 

 mit or exclude the heat, as expedient; so that 

 the smoke, by running through a larger extent, 

 may expend its heat w holly in the flues before it 

 is discharged in the chimney. 



Great care must likewise be taken that neither 



