: eo 
will render the air of the jar worlfe 
than the airof the room. If, after 
afew hours, you invert the experi- 
ment, by placing the plant which 
ftood at the window in the fhade, 
and that which ftood in the fhade 
near the window, the reverfe will 
‘ta : s, viz. the air of. the jar, 
“which was improyed, will be found 
“worle than the air of the room; 
‘and the air of the jar, which had 
been contaminated, will be found 
corrected again. _ And this remark~ 
_~ able property of plants, in the way 
_ juft mentioned, may be demonftrated 
- 45+ oc 
