Now that the _parts_ of all _bodies_, though
never so _solid_, do yet _vibrate_, I think we need go no further for
proof, then that _all_ bodies have some _degrees_ of _heat_ in them, and
that there has not been yet found any thing _perfectly cold_: Nor can I
believe indeed that there is any such thing in Nature, as a body whose
particles are at _rest_, or _lazy_ and _unactive_ in the great _Theatre_ of
the _World_, it being quite _contrary_ to the grand _Oeconomy_ of the
Universe. We see therefore what is the reason of the _sympathy_ or uniting
of some bodies together, and of the _antipathy_ or flight of others from
each other: For _Congruity_ seems nothing else but a _Sympathy_, and
_Incongruity_ an _Antipathy_ of bodies, hence _similar_ bodies once
_united_ will not _easily part_, and _dissimilar_ bodies once _disjoyn'd_
will not _easily unite_ again; from hence may be very easily deduc'd the
reason of the _suspension_ of _water_ and _Quick-silver_ above their usual
_station_, as I shall more at large anon shew.
These properties therefore (alwayes the concomitants of fluid bodies)
produce these following visible _Effects_:
First, They _unite_ the parts of a fluid to its _similar_ Solid, or keep
them _separate_ from its _dissimilar_. Hence _Quick-silver_ will (as we
noted before) _stick_ to _Gold_, _Silver_, _Tin_, _Lead_, &c.
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