40 Vegetable Staticks. 



and lateral fhoots to the tubq /, y feet 

 long, £ of an inch diameter, {Fig. 3.) I fil- 

 led the tube with water, and then immerfed 

 the whole branch as far as over the lower 

 end of the tube, into the veffel nu full of 

 water. 



The water fubfided 6 inches the firft two 

 hours, (being the firft filling of the fap-vef- 

 fels) and 6 inches the following night, 4 

 inches the next day ; and 2 + ^ the following 

 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 im- 

 bibed this day 27 + ' inches in 12 hours 



This experiment fhews the great power 

 of perfpiration ; fince, when the branch was 

 immerfed in the vefiel of water, the 7 feet 

 column of water in the tube, above the fur- 

 face of the water, could drive very little 

 thro' the leaves, till the branch was expofed 

 to the open air. 



This alio proves, that the perfpiring mat- 

 ter of trees is rather actuated by warmth, 

 and ib exhaled, than protruded by the force 

 01 the fap upwards. 



And 



