40 Vegetable Staticks, 



feet long J inch diameter, full of leaves, 

 and lateral fhoots to the tube t, 7 feet 

 long § diameter. (Fig. 3.) I filled the tube 

 with water, and then immerfed the whole 

 branch as far as over the lower end of the 

 tube, into the veffel u u full of water. 



The water fubfided 6 inches the firft 

 two hours (being the firft filling of the 

 fap veffels) and 6 inches the following night? 

 4 inches the next day 5 and 2 -|- J the fol- 

 lowing night. 



The third day in the morning I took 

 the branch out of the water; and hung 

 it with the Tube affixed to it in the open 

 air,- it imbibed this day 27 -J- i inches in 

 12 hours, 



This Experiment (hews the great power 

 of perfpiration y fince when the branch 

 was immerfed in the veffel of water, the 

 7 feet column of water in the tube, above 

 the furface of the water, could drive very 

 little thro' the leaves, till the branch was 

 expofed to the open air. 



This alfo proves, that the perfpiring mat- 

 ter of trees is rather actuated by warmth, 

 and fo exhaled , than protruded by the 

 force of the fap upwards. 



And 



