E434 
lity. One hundred leaves of this 
_ plant, which are very thin, yielded, 
in two hours time, as much dephlo- 
gifticated air as would fill a cylindri- 
cal glafs four inches and a half deep, 
and oné inch and three quarters dia- 
meter; of which quantity gathered 
again afterwards from the fame 
‘leaves, without taking them out of 
the water, fee exp. 30-——35. This 
quantity furpafies = far the bulk of 
the leaves themfelves, and fhews to 
how amazing a quantity the air may 
amount yielded ina fair day by a 
lofty tree. 
The leaves being more or lefs 
crouded together, ‘being expofed 
for a longer or fhorter time, or 
fooner or later in the day, will occa- 
fion fome difference in the GueaEY 
and quantity of this air. 
kt 
