0? THE CUCUMBER. (Jl 



quired according to the heat of the llnhigs, the tem- 

 perature of the weather, and the thicknefs of the co- 

 verings put on at nights. 



When I fay, give air, I mean that the lights fhould 

 be raifed or tilted on the north fide with pieces of 

 wood made in the form of wedges, by means of 

 which little or much air can be admitted at pleafure. 

 The lights or fafhes of frames or boxes are feldoni^ 

 or ever made fo exadl as altogether to exclude the ex-^ 

 ternal air, or to hinder it from having a continual iH" 

 grefs and egrefs, or from going in and coming out 

 of the frames continually. And as the frames get 

 old they wear, and then let in more air than when 

 they are new, fo that new frames may require the 

 u[q of the air-flicks when old frames do not ; there- 

 fore, in giving air, thefe and fuch like matters ought 

 ;ilways to be duly confidered. 



When the wind blows from the eafl and north-eafr, 

 the current of air goes in at the weflernmoft light of 

 each frame, and comes out at the eafternmoft one j 

 and when the wind blows from the weft and north- 

 weft, it is juft the reverfe, for it then goes in at the 

 cafternmoft light of each frame, and comes out at 

 the wefternmoft one. That being the cafe, it is fome- 

 times advifable to give lefs air at the light where the 

 air goes in, than at that at which it comes out ; for 

 when the wind blows ftrong from thofe quarters, as 

 well as from the fouth-weft and fouth-eaft, the 

 end lights of each frame next to the quarters from 

 whence the wind blows, will be the warmeft. 



The 



