C 2 45 ] 

 and found it inferior in quality to 

 common air. 



It might be found reafonable to 

 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 fornix of thefe bub* 

 bles upon the furface of the leaves. 



The fudden appearance and in- 

 creafe of thefe bubbles depend greats 

 ly upon the fixed air fettling on the 

 furface of the leaves \ for 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 

 R 3 water 



