12 The Gardener's New Director. 



yourfelf to forty, which one fire, without doubt, will 

 fufficiently warm, and which, for the firft experiment, 

 I think beft, until you are acquainted with the flues, and 

 their force ol working. Thefe frames fhould be To contri- 

 ved as to be moved, which they mufl: be every two years, 

 as after that time, the Vines are to have one year given 

 them to recover, before they can be forced again. Upon 

 the low wall, in front of the border, a ftout plate of 

 timber fhould be laid, to receive the floping glafTes. 

 'J'hefe glaffes mufl: be divided into two ranges, one above 

 another, as they are to reach from the timber-plate fix- 

 ed on the low wall in the front of the border, to almofl: the 

 top of the high wall, they will be too heavy to tnove if 

 they are longer than fix feet, efpecially as they are to be 

 made of folid vvork, the better to fuflain the glafs, and 

 they fhould be fo contrived as to fiide one over the other 

 for the advantage of admitting air, which is beil done by 

 their having difl'erent grooves to move in ; and in order 

 the better to command them, let there be flops to raife 

 or let them down to different diftances, which may be 

 contrived by having holes made m the frame that fup- 

 ports the glalTcs, to receive ftout iron pins, by way of 

 flops. 



Tlie floping timbers which fupport the glafs-frames 

 fhould be ftcured at bottom in the timber on the low 

 wall, and alfo in that on the high one, by ftrong iron 

 cramps. Thefe timbers mufi: be of fir, and very flout, 

 having a good depth, that their breadth may be the nar- 

 rower, in order to take up as little of the fun as polTible : 

 from the top iliould projeft a frrong board, fix inches 

 deep, and continued along the frames, under which the 

 upper glafTes are to run, to receive the rain; and care 

 muff be taken to have it fo fecured, as not to admit any 

 air on the Vines. 



The breadth of the frames for the glafTes fhould be 

 fhree feet three inches, and to be divide<l into as many 

 fingle frames as the fifty or forty feet wall will require ; 

 the upper glafs frai-nes, as well as the lower, muO: be of 

 the fame dimenfions of breadth, and the bars which fup- 

 port the glafs mufl be placed length-ways; but by no 

 means ftiould any crofs bars be ufed, as they would caufe 

 the moiflure on the iri'''des of tin' gSaffes to fall in drops 

 " upon 



