vegetable Statlch. 
for nine fevcral mornings and evenings a 
middle iized Cabbage plants which grew in 
a garden pot, and was prepared with a leaden 
cover as the Sunflower, Exper, \ft. Its 
greateft perfpiration in 12 hours day was i 
pound 9 ounces 5 its middle perfpiration i 
pound $ ounces, = 32 cubick inches. Its 
furfacc 27 3 6 fquare inches, or 1 9 fquare feet. 
Whence dividing the 32 cubick inches by 
2736 fquare inches, it will be found that 
a little more than the ^ of an inch depth 
perfpires off its furfacc in 1 2 hours day. 
The area of the middle of the Cabbage 
ftem is of a fquare inch ; hence the ve- 
locity of the fap in the ftem, is to the ve- 
locity of the perfpiring fap, on the furfacc 
of the leaves, as 2736 : : : 4268 : t 
for ^ ^- — — 4268. But if an allow- 
100 
ance is to be made for the folid parts of the 
ftem, (by which the palTage is narrowed) the 
velocity will be proportionably incrcafed. 
The length of all its roots 470 feet, their 
periphery at a medium of an inch, hence 
their area will be 256 fquare inches nearly ; 
w^hich being fo fmall, in proportion to the 
area of the leaves, the fap muft go with 
near 
