f_ Longo _hath four of them_.
And yet this Countrey in our Globes is plac'd almost in the midst of the
Torrid Zone (four or five Degrees Southward of the Line.) And our Author
elsewhere tells us of the Inhabitants, that they are so fond of their
Blackness, that they will not suffer any that is not of that Colour (as the
_Portugalls_ that come to Trade thither) to be so much as Buri'd in their
Land, of which he annexes a particular example,[14] that may be seen in his
Voyage preserv'd by our Industrious Countreyman Mr. _Purchas_. But it is
high time for me to dismiss Observations, and go on with Experiments.

[11] _Piso_ Nat. & Med. Hist. _Brasil. lib_ 1. in fine.

[12] _Purchas_ Pilgrim. Second part, Seventh Book 3. Chap. Sect 5.

[13] _Purchas_. Ibid.

[14] _Purchas_ Ibid. in fin

_EXPERIMENT XII._

The way, _Pyrophilus,_ of producing Whiteness by Chymical Praecipitations is
very well worth our observing, for thereby Bodyes of very Differing Colours
as well as Natures, though dissolv'd in Several Liquors, are all brought
into _Calces_ or Powders that are White. Thus we find that not only
Crabs-eyes, that are of themselves White, and Pearls that are almost so,
but _Coral_ and _Minium_ that are Red, being dissolv'd in Spirit of
Vinegar, may be uniformly Praecipitated by Oyl of _Tartar_ into White
Powders. Thus Silver and Tin separately dissolv'd in _Aqua Fortis_, will
the one Praecipitate it self, and the other be Praecipitated by common
Salt-water into a White _Calx_, and so will Crude Lead and Quicksilver
first dissolv'd likewise in _Aqua Fortis_. The like _Calx_ will be afforded
as I have try'd by a Solution of that shining Mineral Tinglass dissolv'd in
_Aqua Fortis_, and Praecipitated out of it; and divers of these _Calces_ may
be made at least as Fair and White, if not better Colour'd, if instead of
Oyl of _Tartar_ they were Praecipitated with Oyl of _Vitriol_, or with
another Liquor I could Name. Nay, that Black Mineral _Antimony_ it self,
being reduc'd by and with the Salts that concurr to the Composition of
common Sublimate, into that Cleer though Unctuous Liquor that Chymists
commonly call Rectifi'd Butter of _Antimony_, will by the bare affusion of
store of Fair Water be struck down into that Snow-white Powder, which when
the adhering Saltness is well wash'd off, Chymists are pleas'd to call
_Mercurius Vitae_, though the like Powder may be made of _Antimony_, without
the addition of any _Mercury_ a