AT ee 
week ; whereas another leaf of the 
fame vine, placed near it in another 
jar, and whofe air bubbles were 
fheok off five or fix times in a day, 
was withered in lefs than two days. 
This fecond leaf had loft the great- 
eft part of the rough furface, which 
covers, as a kind of fcarf-fkin, the 
under and unvarnifhed part of the 
leaf; at leaft this fcarf-fkin became 
tran{parent, if it was not really de- 
ftroyed ; and this tranfparency was 
obferved principally — the very 
{pots of the air bubt “This €x- 
periment was repeated feveral times 
with the fame fuccefs. . 
It fhould feem by this obferva- 
tion, that the lofs of this air, if it 
_ cannot be replaced by the abforp- 
tion of new air from the atmo- 
fphere, makes the leaves decay 
-fooner ; ; and thus the texture of 
| eee the 
