i Ve get able Statich. 87 
' fes to be blown of the fiiape of this here 
defcribed (Fig. 12.) of feveral dimenfions 
at r, from two to five inches diameter, with 
a proportionably large cavity c\ the ftem^ 
as near 5 inch diameter as could be, the 
length of the ftem 16 inches. 
I cemented one of thefe glafs vefTels to 
a large fmooth barked thriving branch of an 
Apple-tree^ which was 1 2 feet lopg, i + 
inch diameter at/; I filled the glafs tube 
with water, and immerfed the fmall end in 
the mercury which rofe but 4 inches, 
yet it imbibed water plentifully j but the 
air iffued too fafl out of the branch at /, 
for the mercury to rife high. 
This, and many other experiments of this 
kind, convince me that branches of 2, 3, 
or 4 years old, are the beft adapted to draw 
the mercury highefl : The veflels of thofe 
that are older being too large and pervious 
to the air, which paffes mofl: freely thro* 
the bark, efpecially at old eyes : As will be 
more fully proved in the fifth chapter. 
Experiment XXVI. 
July 30th at noon, a mixture of fun and 
G 4 clouds. 
