iv The Preface. 



wijhed I could have made the like Ex- 

 periments \ to dif cover the force of the 

 Sap in Vegetables ; but defpaired of 

 ever efieEling it, till, about feven years 

 fince, by mere accident I hit upon it, 

 while I was endeavouring by fever always 

 to flop the bleeding of a?i old Jlem of a 

 Vine, which was cut too near the bleed- 

 ing feaf on, which I feared might kill it: 

 Havings after other means proved inef- 

 fectual, tied a piece of bladder over the 

 tranfverfe cut of the Stem, I found the 

 force of the Sap did greatly extend the 

 bladdery whe?tce I CG?tcluded, that if a 

 long glafs-tube were fixed there in the 

 fame manner, as I had before done to 

 the Arteries of feveral living Animals, 

 I fhould thereby obtain the real afc end- 

 ing force of the Sap in that Stem, which 

 fucceeded according to my expeElation : 

 and hence it is, that I have bee?i infen- 

 fibly led on to make farther pjid far- 

 ther 



