no Vegetable Staticks. 



Experiment XXXIX. 



In order to try if I could perceive the 

 ftem of the Vine dilate and contrad with 

 heat or cold, wet or dry, a bleeding or not 

 bleeding feafon, fome time in February, I 

 fixt to the ftem of a Vine an inftrument in 

 flich a manner , that if the Stem had dilat- 

 ed or contrafted but the one hundredth 

 part of an inch , it would have made the 

 end of the inftrument, (which was a piece of 

 ftrong brafs-wire, eighteen inches long) rife 

 or fall very fenfibly about one tenth of an 

 inch : but I could not perceive the inftru- 

 ment to move, either by heat or cold, a 

 Bleeding cr net bleeding feafon. Yet 

 whenever it rained the ftem dilated fo as to 

 jaife the end of the inftrument or lever -A- 

 of an inch, and when the ftem was dry 

 it fubiided as much. 



This Experiment (hews, that the fa'p (even 

 in the bleeding feafon) is confined in its pro- 

 per vcfiels, and that it does not confufedly 

 pervade every interftice of the ftem, as the 

 rain does, which entering at the perfpiring 

 pores, foaks into the intfcrftices, and there- 

 by dilates the ftem, 



CHAP. 



