40 Vegetable Staticks . 
and lateral fhoots to the tube t , 7 feet 
long, 4 of an inch diameter, {Fig. j.) 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 veflel uu full of 
water. 
The water fubfided 6 inches the firft two 
hours, (being the firft filling of the fap vcf- 
fels) and 6 inches the following night, 4 
inches the next day ; and 2 4- *1 the follow- 
ing 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 2 7 -\~ r inches in 12 hours. 
This Experiment (hews 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 fur- 
face of the water, could drive very little 
thro 5 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 
