f/egetahle Statich, 19 
But It is further to be confidered, that if 
the fap moves in the form of vapor and 
not of water, being thereby ratified, its ve- 
locity will be increafed in a dired 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 muft move 10 times 
fafter i fo that the fame quantity or weight 
of each may pafs in the fame time, thro' 
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 1 2 feveral mornings and evenings, a 
radife flock Apple-tree y 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 all but 163 leaves ; 
whofe furfacc was equal to 1589 fquarc 
inches, or II fquarc feet -j- 5 fquarc inches. 
The greateft quantity it perfpired in 1 2 
C ^ hours 
