)
From this property 'tis, that a drop of _water_ does not mingle with, or
vanish into _Air_, but is _driven_ (by that Fluid equally protruding it on
every side) and forc't into as little a space as it can possibly be
contained in, namely, into a _Round Globule_. So likewise a little _Air_
blown under the _water_, is _united_ or thrust into a _Bubble_ by the
ambient water. And a parcel of _Quick-silver_ enclosed with _Air_, _Water_,
or almost any other _Liquor_, is _formed_ into a _round Ball_.
Now the cause why all these included Fluids, newly mentioned, or as many
others as are wholly included within a heterogeneous fluid, are not
_exactly_ of a _Spherical Figure_ (seeing that if caused by these
Principles only, it could be of no other) must proceed from some other kind
of _pressure_ against the two opposite flatted sides. This _adventitious_
or _accidental pressure_ may proceed from _divers causes_, and accordingly
must _diversifie_ the Figure of the included heterogeneous fluid: For
seeing that a body may be included either with a fluid only, or only with a
solid, or partly with a fluid, and partly with a solid, or partly with one
fluid, and partly with another; there will be found a very great variety of
the terminating _surfaces_, much differing from a _Spherical_, according to
the various resistance or pressure that belongs to each of these
encompassing bodies.
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