it will not be taken off, without leaving some part of it behind
_adhering_ to them. So _Quick-silver_, which will very _hardly_ be brought
to _stick_ to any _vegetable body_, will _readily adhere_ to, and _mingle_
with, several clean _metalline bodies_.
And that we may the better finde what the _cause_ of _Congruity_ and
_Incongruity_ in bodies is, it will be requisite to consider, First, what
is the _cause_ of _fluidness_; And this, _I conceive_, to be nothing else
but a certain _pulse_ or _shake_ of _heat_; for Heat being nothing else but
a very _brisk_ and _vehement agitation_ of the parts of a body (as I have
elswhere made _probable_) the parts of a body are thereby made so _loose_
from one another, that they easily _move any way_, and become _fluid_. That
I may explain this a little by a gross Similitude, let us suppose a dish of
sand set upon some body that is very much _agitated_, and shaken with some
_quick_ and _strong vibrating motion_, as on a _Milstone_ turn'd round upon
the under stone very violently whilst it is empty; or on a very stiff
_Drum_-head, which is vehemently or very nimbly beaten with the Drumsticks.
By this means, the sand in the dish, which before lay like a _dull_ and
unactive body, becomes a perfect _fluid_; and ye can no sooner make a
_hole_ in it with your finger, but it is immediately _filled up again_, and
the upper surface of it _levell'd_.
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