Vegetable Staiicks . i f 
middle fized Cabbage plant , which grew in 
a garden pot, and was prepared with a leaden 
cover, as the Sunflower, Exper . i ft. Its 
greateft perfpiration in twelve hours day 
was i pound 9 ounces 5 its middle perfpira» 
tion 1 pound 3 ounces, — 3 2 cubick inches. 
Its furface 2736 fquare inches, or 19 fquare 
feet. Whence dividing the 32 cubick 
inches by 2736 fquare inches, it will be 
found that a little more than the T V of an 
inch depth perfpires off its furface in twelve 
hours day. 
The area of the middle of the Cabbage 
Item is tt 4 of a fquare inch 5 hence the ve- 
locity of the fap in the ftem, is to the ve- 
locity of the perfpiring fap on the furface 
of the leaves, as 2736 : -K4 : : 4268 : 1 * 
„ 2736 x 1 56 r> 
for — —4268. But if an allow- 
100 
ance is to be made for the folid parts of the 
ftem (by which the paflage is narrowed) the 
velocity will be proportionably increafed. 
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; 
which being fo fmall in proportion to the 
area of the leaves, the fap miift go with 
near 
