8 Vegetable Stattcki. 
roots, and tranfverfe cut of the ftem> are 
gained by a reciprocal proportion of the 
furfaces. 
r,4-- inch 
” Xy inch 
O ) 
C34 inch. 
Now, their pcrfpiring 34 cubick inches in 
twelve hours day, there muft fo much pafs 
thro’ the ftem in thatuimej and the velo- 
city would be at the rate of 34 inches in 
twelve hours, if the ftem were quite hollow. 
In order therefore to find out the quanti- 
ty of folid matter in the ftem, July zyth at 
a. m, I cut up even with the ground a 
Suufiower ; it weighed 5 pounds, in thirty 
days 5 it was very dry, and had wafted in all 
z pounds 4 ounces \ that is \ of its whole 
weight : So here is a fourth part left for 
folid parts in the ftem, (by throwing a piece 
of green Sun-flower ftem into water, I found 
it very near of the fame fpecifick gravity 
with water) which filling up fo much of the 
ftem, the velocity of the fap muft be increaf- 
proportionably, viz. t part more, (by 
reafon 
("leaves — ^616 
o < roots =n zzS 6 
I 
MJUUb 
(^ftem 
— T’S' 
X 
TT-TS”. 
~ I 
