C 72 ] 



{baggy furface ; as, for inflance, the 

 leaves of fage, falvia. 



Some of thefe leaves are fo pro- 

 lific in pufhing out thefe bub- 

 bles, that I have found them re- 

 produced nine or ten times in leaves 

 of a pear-tree. The leaves of a 

 vine are alfo very ready to yield a 

 good number of fucceflions of thefe 

 bubbles. Bat I was curious to fee 

 whether the leaves decay fooner or 

 later when the air bubbles were left 

 upon them, or when they were 

 fhook off now and then : I put a 

 leaf of a vine in a jar full of pump- 

 water, and left it expofed to the 

 open air without ever ftirring it : 

 the air bubbles grew to a very large 

 ilze ; and fome of them quitted the 

 leaf of themfelves and rofe up. 

 This leaf remained as frefh as when 

 it was put in the jar during a whole 



week^ 



