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 _Salt-peter_, 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, or take fire and burn; but a part also which is fixt, terrestrial, and irrarefiable.