t heat, and that which we call Fire; and this is common also to many
dissolutions of other bodies, made by _menstruums_, of which I could give
multitudes of Instances.

Fourthly, _that this action_ is perform'd with so great a violence, and
does so minutely act, and rapidly agitate the smallest parts of the
_combustible_ matter, that it produces in the _diaphanous medium_ of the
Air, the action or pulse of light, which what it is, I have else-where
already shewn.

Fifthly, _that the dissolution_ of sulphureous bodies is made by a
substance inherent, and mixt with the Air, that is like, if not the very
same, with that which is fixt in _Salt-peter_, which by multitudes of
Experiments that may be made with _Saltpeter_, will, I think, most
evidently be demonstrated.

Sixthly, _that in this dissolution_ of bodies by the Air, a certain part is
united and mixt, or dissolv'd and turn'd into the Air, and made to fly up
and down with it in the same manner as a _metalline_ or other body
dissolved into any _menstruums_, does follow the motions and progresses of
that _menstruum_ till it be precipitated.

Seventhly, That as there is one part that is dissoluble by the Air, so are
there other parts with which the parts of the Air mixing and uniting, do
make a _Coagulum_, or _precipitation_, as one may call it, which causes it
to be separated from the Air, but this _precipitate_ is so light, and in so
small and rarify'd or porous clusters, that it is very volatil, and is
easily carry'd up by the motion of the Air, though afterwards, when the
heat and agitation that kept it rarify'd ceases, it easily condenses, and
commixt with other indissoluble parts, it sticks and adheres to the next
bodies it meets withall; and this is a certain _Salt_ that may be extracted
out of _Soot_.

Eighthly, that many indissoluble parts being very apt and prompt to be
rarify'd, and so, whilest they continue in that heat and agitation, are
lighter then the Ambient Air, are thereby thrust and carry'd upwards with
great violence, and by that means carry along with them, not onely that
_Saline concrete_ I mention'd before, but many terrestrial, or indissoluble
and irrarefiable parts, nay, many parts also which are dissoluble, but are
not suffer'd to stay long enough in a sufficient heat to make them prompt
and apt for that action. And therefore we find in _Soot_, not onely a part,
that being continued longer in a competent heat, will be dissolv'd by the
Air,