ogether, and that in a new Order, by which means the
Motion may sometimes produce Permanent changes of Colours, as in the
Experiment you will meet with hereafter, of presently turning a Snowy White
Body into a Yellow, by the bare Affusion of fair Water, which probably so
Dissolves the Saline Corpuscles that remain'd in the _Calx_, and sets them
at Liberty to Act upon one another, and the Metall, far more Powerfully
than the Water without the Assistance of such Saline Corpuscles could do.
And though you rubb Blew _Vitriol_, how Venereal and Unsophisticated soever
it be, upon the Whetted Blade of a Knife, it will not impart to the Iron
its Latent Colour, but if you moisten the _Vitriol_ with your Spittle, or
common Water, the Particles of the Liquor disjoyning those of the
_Vitriol_, and thereby giving them the Various Agitation requisite to Fluid
Bodies, the Metalline Corpuscles of the thus Dissolv'd _Vitriol_ will Lodge
themselves in Throngs in the Small and Congruous Pores of the Iron they are
Rubb'd on, and so give the Surface of it the Genuine Colour of the Copper.

25. There remains yet a way, _Pyrophilus_ to be mention'd, by which a
Liquor may alter the Colour of another Body, and this seems the most
Important of all, because though it be nam'd but as One, yet it may indeed
comprehend Many, and that is, by Associating the Saline Corpuscles, or any
other Sort of the more Rigid ones of the Liquor, with the Particles of the
Body that it is employ'd to Work upon. For these Adventitious Corpuscles
Associating themselves with the Protuberant Particles of the Surface of a
Colour'd Body, must necessarily alter their Bigness, and will most commonly
alter their Shape. And how much the Colours of Bodies depend upon the Bulk
and Figure of their Superficial Particles, you may Guess by this, that
eminent antient _Philosophers_ and divers _Moderns_, have thought that all
Colours might in a general way be made out by these two; whose being
Diversify'd, will in our Case be attended with these two Circumstances, the
One, that the Protuberant Particles being Increas'd in Bulk, they will
oftentimes be Vary'd as to the Closness or Laxity of their Order, fewer of
them being contain'd within the same Sensible (though Minute) space than
before; or else by approaching to one another, they must Straighten the
Pores, and it may be too, they will by their manner of Associating
themselves with the Protuberant Particles, intercept new Pores. And t