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week ; whereas another leaf of the 

 fame vine, placed near it in another 

 jar, and whofe air bubbles were 

 ihook off five or fix times in a day, 

 was withered in lefs than two days. 

 This fecond leaf had loft the great- 

 er!: part of the rough furface, which 

 covers, as a kind of fcarf-fkin, the 

 under and unvarnifhed part of the 

 Jeaf ; at leaft this fcarf- fkin became 

 tranfparent, if it was not really de- 

 ftroyed ; and this tranfparency was 

 obferved principally upon the very 

 fpots of the air bubbles. This ex- 

 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 



the 



