the plant-is fhut up with: the air, 
: Tt &% J 
as the air, in which it grows, con- 
tains more of this principle. 
- When a plant grows in the open 
air, it contaminates by night the 
furrounding air; but this air, being 
diluted with other air, does not ap- 
pear in reality to be altered by any 
_ -tnethod yet found out: “befides, it 
_ 4is probable, that this air is rifen up 
asfoon as it was become phlogitti- 
cated by the plant, being fpecifically 
lighter than common air. It feems 
therefore se improbable, thatdome 
plants, as fe yall} 
reoriean inate: in reality more air 
at oe than they improveinthe day; 
“fo that, if all the air fpoiled by fuch 
“w-plant was {hut up with the plant 
_<a°whole night and a day, the air 
“would ftill be found contaminated : 
_ “but tho’this might be the cafe when 
yet 
