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formed by Mr. Thomson, that after repeated trials, 

 the thin canvass was found the preferable article for 

 utility, appearance, and duration. This description 

 of fabric costs about 4d. per yard, procured from 

 Dundee. It requires to be joined into convenient 

 lengths, or into the whole length of the wall to be 

 covered, and bound with tape at top and bottom, and 

 to have loops or rings sewed to it at top, by which it 

 is secured to small hooks screwed to the upper side of 

 the coping-boards. These hooks serve also for attach- 

 ing the ends of pieces of twine, which are stretched 

 down to pegs driven in a line four feet from the bot- 

 tom of the wall. These twine-rafters are stretched at 

 intervals of twelve feet, and support the canvass at a 

 uniform slope, the appearance being that of an elegant 

 light roof, reaching to within three feet of the ground. 

 The coping-boards are put up before the blossom-buds 

 of the peach-trees are swelled so much as to exhibit 

 the tips of the petals ; and before the most forward 

 buds open, the thin canvass (or netting, if that should 

 be preferred,) should be attached to the hooks. The 

 covering is generally put up about the beginning of 

 March, and it remains on without being opened or 

 altered, till all danger from frost is over, which is 

 generally, in the climate of London, about the middle 

 of May. The coping is entirely removed at the same 

 time as the canvass, because the trees are found to 

 thrive much better when exposed to perpendicular 



