explicitly and circumstantially to deliver, especially since I now find
(though late and not without some Blushes at my prolixity) that what I
intended but for a short Essay, is already swell'd into almost a Volume.

_EXPERIMENT L._

Yet here, _Pyrophilus_, I must take leave to insert an Experiment, though
perhaps you'l think its coming in here an Intrusion, For I confess its more
proper place would have been among those Experiments, that were brought as
proofs and applications of our Notions concerning the differences of Salts;
but not having remembred to insert it in its fittest place, I had rather
take notice of it in this, than leave it quite unmention'd: partly because
it doth somewhat differ from the rest of our Experiments about Colours, in
the way whereby 'tis made; and partly because the grounds upon which I
devis'd it, may hint to you somewhat of the Method I use in Designing and
Varying Experiments about Colours, and upon this account I shall inform
you, not only What I did, but Why I did it.

I consider'd then that the work of the former Experiments was either to
change the Colour of a Body into another, or quite to destroy it, without
giving it a successor, but I had a mind to give you also a way, whereby to
turn a Body endued with one Colour into two Bodies, of Colours, as well as
consistencies, very distinct from each other, and that by the help of a
Body that had it self no Colour at all. In order to this, I remembred, that
finding the Acidity of Spirit of Vinegar to be wholly destroy'd by its
working upon _Minium_ (or calcin'd Lead) whereby the Saline particles of
the _Menstruum_ have their Taste and Nature quite alter'd, I had, among
other Conjectures I had built upon that change, rightly concluded, that the
Solution of Lead in Spirit of Vinegar would alter the Colour of the Juices
and Infusions of Several Plants, much after the like manner that I had