[ xxxvi J 
. and even the mofi poifonous plants 
perjorm this office in common with 
the mildef? and the moft falutary ; 
that the mofi part of leaves pour 
out the greateft quantity of this depblo- 
Liflicated air from their under furface, 
principally thofe of lofty trees; that 
young leaves, not yet come to their 
| full perfeciion, yield dephlogifticated 
aw lefs in quantity, and of an in- 
fertor quality, than what is produced 
by full-grown and old leaves; that 
fome plants elaborate depblogifiicated 
ar better than others; that fome 
of the aquatic plants jeem i excell 
in this operation; tbat all” pla; 
contaminate the furrounding a air 1 by 
night, and even in the day-time 
in foaded piaces ; that, howevery — 
fome of thofe which are inferior. to 
none in yieléing benefcial. air in 
gee fun-fbine, se dees others in the 
. pene 
