[ 29 ] 
immediately into cold water, are re- 
markably quick in forming air bubs 
bles, and. yielding the bett dephlo- 
gifticated air. 
lf it was the warmth of the. fun, 
and not its light, that produced this 
operation, it, would follow, that, by 
warming the water near the fire 
about. as much as it would have 
been in the fun, this very air would 
be produced; but this.is far from 
being the cafe. | 
I placed .fome leaves. in. rere 
water, inverted the. jar,. and. kept i it 
as near the fire as was required to 
receive a moderate warmth, near as 
much as a fimilar jar, filled with 
leaves of the fame plant, and placed 
in the open air, at the fame time 
received from thefun. The refult 
was, that the air obtained by the — 
2 
