i}8 Vegetable Statich. 



to a vapour, before it can enter them, the 

 fun's warmth on the bark fhould moft eafily 

 difpofe fuch rarefied fap to afcend, inftead of 

 defcending. 



Experiment XLV. 



July 27th, I took fever al branches of Cur- 

 rans, Vines, Cherry, Apple, Pear and Plum- 

 tree ■ and fet the great ends of each in veffels 

 of water x (Fig. 3 1.) 5 but firft took the bark 

 for an inch off one of the branches, as at z, 

 to try whether the leaves above z at b would 

 continue green longer than the leaves of any 

 of the other branches a, c y d, but I could 

 find no difference, the leaves withering all at 

 the fame time : Now, if the return of the fap 

 was flopped at z, then it would be expe&ed, 

 that the leaves at b fhould continue green lon- 

 oer than thofe on the other branches; which 

 did not happen, neither was there any moi- 

 fture at z. 



Experiment XL VI. 



In Augujl, I cut off the bark for an inch 

 round, of a young thriving Oak -branch, 

 on the North -weft fide of the tree. The 



leaves 



