[- 245. ] 
and found it inferior in quality ta 
common air. 
It might be found reafonable ta 
think, that thofe numerous air- 
bubbles, which appear upon the 
leaves as foon as put under the fur- 
face of the water impregnated with 
fixed air, are owing to the fixed air 
fettling in the form of thefe bub- 
bles upon the furface of the leaves. 
The fudden appearance ang in- 
creafe of thefe bubbles 
furface of the leaves ; ora any other 
body gets alfo bubbles in fuch wa- 
ter; but the vital motion of the 
leaves acts its part in this fcene; for 
thefe bubbles appear firft on the 
fame furface of the leaves on which 
they appear in common water. It — 
appeared, by a variety of experi- 
ments I made on this head, that 
See | water 
