FOR 



FOR 



iipr'ight glass-work, hc.id high, ranging iinmcJi- 

 atcly along the front, and from the top of which 

 a glass roof is carried to the top ot the back 

 or main wall: when wrought by dung-heat, it 

 is cliiefiy applied against the outside of the back 

 wall, and by being formed into a bed internally : 

 when by bark-heat, by forming it into a bed in a 

 pit within-side ; and when by fire-heat, bv having 

 several returns of flues against the inside of the 

 back wall, and that of the front and both ends, 

 for the heat to pass along, constructed ac- 

 cording lo the sorts of plants chiefly intended 

 to be forced, and the nature of the materials to 

 be employeil in producing the heal. 



Where the lirst kind of niaterial is employed 

 in affording heat, the frame is usually formed 

 with an upright back and ends of deal i>lanking, 

 and a sloping front of moveable glass-lighis ; the 

 length may be ten , twenty, or thirty feet, or more ; 

 the width, from three to live (or more), and five or 

 six high ; the frame work should be of inch-and- 

 half deal planking, tongued, and closely joined, 

 that no steam from the dung may penetrate into 

 the frame ; raised five, six, or seven feet hiirh be- 

 hind, and only ten or twelve inches higli inlVonl, 

 raising both ends answerable to the front and back ; 

 tiic glass-work to range, from the ujiright in 

 front, sloping upward towards the back wall, to 

 about a foot width at top, there resting the ends 

 upon proper frame-work of wood ; and bars or 

 bearers, three inches in width, ranged slopingfrom 

 the back to front, for the support of tlie lights, 

 as in common hot-bed frames, and the top of all 

 boarded wind and water tight ; having sometimes 

 within-side two or three ranges of narrow shelves 

 along the back and ends, for pots of small plants, 

 and the bottom levelled, on which to place pots 

 of larger kinds ; or shelves may be made rising 

 one behind another quite from the front halfway 

 up the back wall, in order to place the lowest 

 plants in front, the others in order behind 

 them, rising gradually to the tallest in the 

 back rows. 



In working these frames; after having placed 

 the pots of plants in regular order, the lights are 

 put on, and a sufficient qviantity of fresh hot 

 stable-dung, prepared as for common dung hot- 

 beds, is to be piled up close against the outside 

 of the back and ends, a yard wide at bottom, 

 drawing it gradually into a foot width at top, fi- 

 nishing it somewhat sloping, to throw off wet ; 

 and as the dung settles or sinks down, a fresh 

 supply must be added at top, to maintain the 

 linmg to the full height of the frame, additiot.s 

 being occasionally made of fresh dung as the 

 heat declines ; by this means a fine growing 

 heat will be thrown in. See Hot-Bed. 



Where bark is made use of in producing 



heat, tlie frame maj be constniclcd eiilier of 

 wood or brick-woric, and fronted, &c. with 

 sashes of glass as the former j the length mav be 

 ten, twenty, or thuly feet, or more ; eight or ten 

 wide, and six or eight high ; and, like.thc dung- 

 heat frame, be six or eight feet hii.'h behind, and 

 one in front, the ends conformable and slopiuL, 

 having glass-work frames raised J'roin the front, 

 sloping either quite to the top of the back wall, 

 or inclined only about one half towards that jiari, 

 meeting a tiled roof at top half way, which * 

 should be raised high enouph in froi.t to throw 

 the water off beiiind, as well as to admit as nuieh 

 sun as possible to every part of the frame : it 

 may likewise be constructed with an upri^hi 

 front of glass, head high, and a sloping roof of 

 glass-work, ranging from the upright front to the 

 top of the back wall, which is the most eligible 

 form, both for convenience and benefit of the 

 plants; either of which constructions mav be 

 erected detached, or against a south wall already 

 built, which will serve for the hack, and save 

 some expense ; the ends may either be of wood 

 or brick, and should be glazed like the front. 

 See. and the glass-work in every part be made to 

 move on and off, as well as to slide backw ard and 

 forward to give air, and perform other necessary 

 work. A tone end, near the back wall, a door should 

 bemadetoenleroccasionaliy at, and within -side a 

 pit formed lor the bark-bed, three feet deeji, 

 part sunk, the greater part raised, continued the 

 whole length and width, except about a foot and 

 half alley to pass in to perform the necessary 

 cidture, as well as view and gather the produce 

 of the different plants. 



The pit within is to be filled with new tan in 

 order to afford a proper heat for the arowth and 

 support of the plants that are to be'cultivated. 

 See Hot- Bed. 



Where fire-heat is to be employed, the frame 

 must be formed of brick-woik, at least the back 

 or main wall, for the convenience of havins; fire- 

 flues, and the whole front, £>cc. be glass like the 

 other sorts; the lenglli may be fro; n twenlv to 

 forty or fifty feet, or more, ' though one fire will 

 not warm more than that length ; "the width from 

 five or six to twelve or fifteen feet, and ci^lit or ten 

 high. In this case the fire is burned in^ii furnace 

 behind at one end or middle, thence com- 

 municating the heat by internal flues or funnels 

 running the whole length of the back wail in 

 three or four returns one above another, and 

 continued in one or two flues in the front. 

 And trani'.s thus constructed may be con- 

 trived eitiur of moderate width for one row 

 of trees only, to range against the back wall, 

 or may be capacious enough to have a range 

 of trained wall-trees behind, and some small 

 3 C 



