t/egetable Static ks . ip 
Bat it is further to be confidered, that if 
the fap moves in the form of vapor and 
not of water, being thereby rarified, its ve- 
locity will be increafed in a direft propor- 
tion of the fpaces, which the fame quan- 
tity of water and vapor would occupy : 
And if the vapor is fuppofed to occupy 10 
times the fpace which it did, when in the 
form of water, then it mu ft move ten times 
fafter j fo that the fame quantity or weight 
of each may pafs in the fame time, thro 9 
the fame bore or tube : And fuch allow- 
ance ought to be made in all thefe calcu- 
lations concerning the motion of the fap in 
vegetables. 
Experiment IV. 
From July 29, to Aug. 25. I weighed 
for 12 feveral mornings and evenings, a 
radife fiock Apple-tree , which grew in a 
garden pot, covered with lead, as the Sun- 
flower : it had not a bufhy head full of leaves, 
but thin fpread, being in ail but 1 63 leaves 
whofe fur face was equal to 1589 fquare 
inches, or 1 1 fquare feet 5 fquare inches. 
The greateft quantity it perfpired in 12 
C % hours 
