

Vegetable Statkks. 



131 



■ 



which are mod expofed to the Sun, as the 



bark is. 



And when we confidcr, that the fap vcf- 



fels arc To very line, as to reduce the lap al- 



moft to a vapour, before it can enter them, 



the Sun's warmth on the bark fhould mo ft 



eafily difpofe fuch rarified fap to afcend? 



inftead of defcending. 



Experiment XLV. 



• 







I*. 



1 



July 2 7th, I took feveral branches of Cur- 

 rans, Vines, Cherry, Apple, Tear and Tlum- 

 tree, and fet the great ends of each in veflels 

 of water x, (Fig. 31.) but fir ft took the bark 

 for an inch off one of the branches, as ats, 

 to try whether the leaves above z at b 

 would continue green longer than the leaves 

 of any of the other branches a, c, d -, but I 

 could find no difference, the leaves wither- 

 ing all at the fame time : Now, if the re- 

 turn of the fap was flopped at z, then it 

 "would be expected, that the leaves at b mould 

 continue green, longer than thofc on the o- 

 ther branches, which did not happen, neither 

 was there any moifture at 





z. 



K 2 



Expe-' 



