Another thing
which is very observable, is, that if you find any place where the colours
are very broad and conspicuous to the naked eye, you may, by pressing that
place with your finger, make the colours change places, and go from one
part to another.
There is one _Phaenomenon_ more, which may, if care be used, exhibit to the
beholder, as it has divers times to me, an exceeding pleasant, and not less
instructive Spectacle; And that is, if curiosity and diligence be used, you
may so split this admirable Substance, that you may have pretty large
Plates (in companion of those smaller ones which you may observe in the
Rings) that are perhaps an 1/8 or a 1/6 part of an inch over, each of them
appearing through the _Microscope_ most curiously, intirely, and uniformly
adorned with some one vivid colour: this, if examined with the
_Microscope_, may be plainly perceived to be in all parts of it equally
thick. Two, three, or more of these lying one upon another, exhibit
oftentimes curious compounded colours, which produce such a _Compositum_,
as one would scarce imagine should be the result of such _ingredients_: As
perhaps a _faint yellow_ and a _blew_ may produce a very _deep purple_. But
when anon we come to the more strict examination of these _Phaenomena_, and
to inquire into the causes and reasons of these productions, we shall, I
hope, make it more conceivable how they are produced, and shew them to be
no other then the natural and necessary effects arising from the peculiar
union of concurrent causes.
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