| Boyle, Robert New experiments physico-mechanicall, touching the spring of the air and its effects 1660 |
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then it self, and why that which produc'd
the bubbles above mention'd should not
be resolutely said to be nothing else then
a more active and spirituous part of the
Water, we shall, in order to the Elucida
tion of this matter, subjoyn to what
was formerly deliver'd the following Ex
periment.
WE recited in our nineteenth Ex
periment, how by drawing most
of the Air out of the Receiver, we made
the Water subside by degrees in a Glass
not four Foot long: We shall now adde,
that in the like Experiment made in such
a Tube, or a greater, it may be observ'd,
That when the Water begins to fall, there
will appear store of bubbles fasten'd all a
long to the sides of the Glass; of which
bubbles, by the agitation of the Vessel
consequent upon pumping, there will arise
good numbers to the top of the Water,
and there break; and as the Cylinder of
Water is brought to be lower and lower,
so the bubbles will appear more numerous
in that part of the Tube which the Water
yet fills; and the nearer the surface of the
Water, in its descent, approaches to these
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