Vegetable Staticks. 87 
this branch I put into the cylindrical glafs 
er, which was an inch diameter within, 
and eight inches long. 
I then cemented faft the joynt r , firft fold- 
ing a (trap of fheeps-skin round the ftem, 
fo as to make it fit well to the tube at r > 
then I cemented faft the joynt with a 
mixture of Bees-wax and Turpentine melt- 
ed together in fuch a proportion, as to 
make a very ftiff clammy Fafte when cold, 
and over the cement I folded feveral times 
wet Bladders, binding it firm with Pack- 
thread. 
At the lower end of the large tube e was 
cemented, on a leftfer tube z P, 4 inch dia- 
meter in bore, and 1 8 inches long : The 
fubftance of this tube ought to be full 4 of 
an inch thick, elfe it will too eafily break 
in making this experiment, 
Thefe two tubes were cemented together 
at e , firft with common hard brick-duft ce- 
ment to keep the tubes firm to each other 5 
but this hard cement would, both by being 
long moift, and by the different dilatations 
and contractions of the glafs and cement, 
feparate from the glafs in hot weather, fo 
as to let in air , to prevent which incon- 
venience, I further fecured the joynt with 
G 4 the 
