So that all three being united, and not very dissimilar, by means of this
contact, if care be taken that the Tube in erecting be not shogged, the
_Quicksilver_ will remain suspended, notwithstanding its contrary indeavour
of Gravity, a great height above its ordinary Station; but if this
immediate Contact be removed, either by a meer separation of them one from
another by the force of a shog, whereby the other becomes imbodied between
them, and licks up from the surface some agil parts, and so hurling them
makes them air, or else by some small heterogeneous agil part of the Water,
or Air, or Quicksilver, which appears like a bubble, and by its jumbling to
and fro there is made way for the _heterogeneous AEther_ to obtrude it self
between the Glass and either of the other Fluids, the Gravity of _Mercury
precipitates_ it downward with very great violence; and if the Vessel that
holds the restagnating _Mercury_ be convenient, the _Mercury_ will for a
time _vibrate_ to and fro with very large _reciprocations_, and at last
will remain kept up by the pressure of the external Air at the height of
neer thirty inches. And whereas it may be objected, that it cannot be, that
the meer imbodying of the _AEther_ between these bodies can be the cause,
since the _AEther_ having a free passage alwayes, both through the Pores of
the Glass, and through those of the Fluids, there is no reason why it
should not make a separation at all times whilst it remains suspended, as
when it is violently dis-joyned by a shog.
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