PORTABLE, TEMPORARY, AND MOVEABLE STRUCTURES. 173 



Strength than larger- sized panes. The frame, fig. 112, may be six to nine 

 mches high in front, and from fifteen to eighteen inches high at back. 

 These small sashes, when not wanted for hand-glasses, or rather hand-frame 

 coverings, Mr. Forsyth proposes to use as roofing to peach- houses, vineries, 

 &c., and for various other purposes ; and he anticipates, and we think with 

 reason, great economy from their adoption in gardens. Fig. 113 is an end 

 view of the box, showing the uprights at the angles for supporting the sash, 

 either close over the box, or raised to different heights to admit more or 

 less air. By means of the notched uprights, the sash may either be raised 

 six inches above the box at top and bottom, or it may be raised three or 

 six inches at the back, and not raised, or raised only three inches in front, so 

 as to admit more or less air at pleasure, and yet throw off the rain ; the sash 

 being in any of these cases held firm in its place, so as not to be liable to be 

 disturbed by wind. The pivots which fit into the notches are square, in 

 order to admit of their being mounted on rafters of different kinds, so as 

 to form coverings to frames, pits, or even forcing- houses. Supposing, says 

 Mr. Forsyth, a bed of violets, running east and west, in the open air, twelve 

 feet long and three feet six inches wide : drive seven notched pegs two feet 

 apart down the centre of the bed to stand one foot above ground, and seven 

 down each side at the same distance apart, but only four inches out of the 

 ground : then, to make the sides and gable ends, take a piece of turf four 

 feet by four feet, shaped out with the edging-iron, and taken up with the 

 turfing or floating spade, an inch and a half thick, of the proper shape, so 

 that it may be set on edge and kept so by a peg on each side, and having the 

 green side out ; Avhen the lights are put on with every alternate one higher 

 than and embracing the iron edges of the two under it, you will have a very 

 elegant little flower-house, which a labourer might erect in an hour w^ith 

 sixpennyworth of building materials, and the finished structure would have 

 thus every other light hinged and ready to admit air or allow of watering 

 and gathering flowers like a complete forcing-house. We regard this as 

 promising to be one of the most useful and economical inventions that have 

 been introduced in horticulture for some time. This box may be used in 

 the open ground for forcing sea-kale, rhubarb, and for a variety of other 

 purposes. See Gard. Mag. 1841. 



463. Canvass coverings for glazed structures or detached plants require 

 for the most part to be in framed panels, as well to keep them tight as to 

 throw off the rain, and to prevent them from being blown and beat about 

 by the wind. To render the canvass more durable, it may be oiled, tanned, 

 or soaked in Kyan's or in Burnett's anti-dry rot composition. When applied 

 to cover the glass sashes of frames or pits, it should be in panels in wooden 

 frames of the size of the sashes ; and this is also a convenient and safe mode 

 of forming temporary structures for protecting standard plants or trees ; but 

 by suitable arrangements, to be hereafter described, canvass or netting for 

 protecting walls may be hooked on and fastened without wooden frames. 

 This is done in a very efficient manner in the garden of the Horticultural 

 Society of London, to protect a peach- wall. The stone coping of this wall 

 projects over it about an inch and a half, w^ith a groove or throating under- 

 neath. Coping-boards nine inches broad, fitted to join at their ends by 

 means of plates of iron, are supported on iron brackets built into the wall. 

 Fig. 1 14 shows one of these brackets, in w^hich a is an iron which is built 

 into the wall, the thickness of a board below the stone copina* ; and &, the 



