Vegetable Staticks 2 1 
depth perfpired in 12 hours day, viz. tt? 
of an inch, 
in the vine in 12 
So the fcveral fore- 
going perfpirations 
in equal areas arc. 
hours day* 
tV in a man, in a day 
and a night. 
t 4 t in a funflower, 
in a day and night. 
^ tV in a cabbage, in 12 
hours day. 
-4*7 in an apple-tree? 
in 12 hours day. 
ttt in a limon-tree, 
l in 12 hours day. 
The area of the tranfverfe cut of the ftem 
of this Limon-tree was = 1 . 44 of a 
fquare inch 5 hence the fap’s velocity here, 
will be to its velocity on the furface of the 
t ~ 2SS7 X ICO 
leaves, as 176$ : 1 for — •— 1 76S, 
144 
This isfuppofing the whole ftem to be a hol- 
low tube 5 but the velocity will be increafed 
both in the ftem and the leaves, in propor- 
tion as the pafiage of the fap is narrowed by 
the folid parts. 
By comparing the very different degrees 
©f perfpiration, in thefe 5 plants and trees, 
C 3 we 
