212 THE FORCING GARDENER. [B, !>, 



y SECTION III. 



On tie AdmiJJion of Air to tJje Green-Houfe, 



AIR and light are of the greateft corir- 

 fequence to the welfare of tfye 

 plants y and ought to be encouraged at all 

 times. In fome Green-houfes., it; is comr 

 mon to covei* at night with canvas, mats, 

 &c. in order to fave fuel in winter. Thefe 

 fhould always be removed betimes in the 

 morning, to admit the rays of-light as they 

 break from the fyorizon ; and fhould never be 

 put on at night till the twilight, to exclude 

 them. A free and large circulation of air 

 muft be admitted, according to the wea- 

 ther 5 even frofty air in Winter muft not 

 be entirely excluded, efpecially in fun- 

 fliine. 



In the Spring, keep the houfe cool and[ 

 well-aired ; otherwife the plants will grow 

 both too tender and too rapidly, to bear 

 the weather when fet out of doors, without 

 being much hurt at firft : and for feveral 

 weeks previous to the plants being put out, 



the 



