P4 Vegetable Staticks. 
(as the warmth of the fun increafes upon it) 
unlefs you fill the tube firft full of water: 
For if half or \ of the large tube cr be full 
of air, that air will be rarified by the fun j 
which rarefafhion will deprefs the water in 
the tube, and confequently the mercury can- 
not rife. 
But where little water is imbibed the 
firft day, (as in the cafe of the green Ihoots 
of the Vine, Exper. XXIII.) then the mer- 
cury will rife the fecond and third day, as 
the warmth of the fun comes on, without 
refilling the little water that was imbibed. 
Experiment XXV. 
In order to make the like experiment 
on larger branches (when I expe&cd the 
mercury would have rifen much higher than 
in fmall ones) I caufed glaffes to be blown 
of the lhapeof this here deferibed (Fig. 12.) 
of feveral dimenfions at r, from two to 
five inches diameter, with a proportionably 
large cavity c: the ftem z as near 4 inch 
diameter as could be, the length of the 
ftem 16 inches. 
I cemented one of thefe glafs vefiels to 
a large fmooth barked thriving branch of an 
Apple-tree, which was 1 2 feet long, x + i 
1 inch 
