4 o Vegetable Stattch * 
feet long \ inch diameter, full of leaves, 
and lateral fhoots to the tube 7 feet 
long i 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 veflel u it full of water. 
The water fubfided 6 inches the firft 
two hours (being the firft filling of the 
fap veftels) and 6 inches the following night> 
4 inches the next day^, and 2 -|- ~ 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 i inches in 
12 hours. 
This Experiment fhews the great power 
of perfpiration ; 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 aduared by warmth, 
and fo exhaled , than protruded by the 
force of the fap upwards. 
An4 
