Vegetable Staticks. 135 



But to return to the fubjed of the mo- 

 tion of the fap; when the fap has ftrftpafTcd 

 thro' that thick and fine ftrainer, the bark of 

 the root, we then find it in greateft quanti- 

 ties, in the rnoft lax part, between the bark 

 and wood, and that the fame thro' the whole 

 tree. And if in the early fpring, the Oak 

 and feveral other trees were to be examined 

 near the top and bottom, when the fap firft 

 begins to move, fo as to make the bark ea- 

 sily run, or peel off, I believe it would be 

 found, that die lower bark is firft rnoiftened 5 

 whereas the bark of the top branches ought 

 firft to be moiftened, if the fap defcends by 

 the bark : As to the Vine, I am pretty well 

 allured that the lower bark is firft moiftened. 



We fee in many of the foregoing Expe- 

 riments, what quantities of moifture trees 

 do daily imbibe and perfpire : Now the ce- 

 lerity of the fap muft be very great, if that 

 quantity of moifture muft, moil of it, at 

 cend to the top of the tree, then defcend, 

 and afcend again, before it is carried off by 

 peripiration. 



The defecl of a circulation in vegetables 

 feems In fome rneafure to be fupplied by 

 the much greater quantity of liquor, which 



K 4 the 



