C 6 9 ] 



' they abfolutely tend to foul the air, 

 principally when they flower. I 

 acknowledge readily, that a few 

 flowers-pots can do neither good nor 

 harm. But I remember to have 

 found feveral orange- trees in a room, 

 by way of ornament, and, as I was 

 told, to keep the air of the room 

 wholefome : I think now fuch or- 

 namental plants by no means indif- 

 ferent, unlefs they were but fmall 

 and the room ample ; at any rate 

 I ihould net fufFer them to be kept 

 in a room at night, where a lick 

 perfon is. 



A plant mut up in a glafs jar, 

 and placed near the window in a 

 room fo as to receive the rays of 

 the fun, will make the air of the 

 jar better than the air of the room : 

 whereas a fimilar plant, placed in 

 the fame room in a fhaded place, 

 F 3 will 



