1 8 Vegetable Statkks . 
favour of the eminent Mr. Wife. This 
vine was prepared with a cover, as the Sun- 
flower was. Its greateft perfpiration in iz 
hours day, was 6 Ounces-]- 240 grains 5 its 
middle perfpiration 5 ounces 240 grains 
— to 9i cubick inches. 
The furface of its leaves was 1820 fquare 
inches, or 12 fquare feet -f* 92 fquare 
inches 5 whence dividing 9i* cubick inches, 
by the area of the leaves it is found that 
t4t part of an inch depth, perfpires off in 
12 hours day. 
The area of a tranfverfe cut of its ftem, 
was equal to | of a fquare inch : hence the 
lap’s velocity here to its velocity on the fur- 
face of the leaves, will be as 1820 x 4 — 
7280: 1. Thenihereal velocity of the fap’s 
motion in the ftem is = 2 r*r — 38 inches 
in twelve hours. 
This is fuppoling the ftem to be a hollow 
tube : but by drying a large vine branch (in 
the chimney corner) which I cut off, in the 
bleeding feafon, I found the folid parts were 
\ of the ftem 5 hence the cavity thro* which 
the fap pafles, being fo much narrowed, its 
velocity will be 4 times as great, viz. 1 5 2 
inches in 12 hours. 
But 
