) And yet
you need not Glasses of an extraordinary shape to see an instance of what
the vari'd mixture of Light and Shadow can do in the diversifying of the
Colour. For if you take but a large round Vial, with a somewhat long and
slender Neck, and filling it with our Red Infusion of Brazil, hold it
against the Light, you will discern a notable Disparity betwixt the Colour
of that part of the Liquor which is in the Body of the Vial, and that which
is more pervious to the Light in the Neck. Nay, I remember, that I once had
a Glass and a Blew Liquor (consisting chiefly (or only, if my memory
deceive me not,) of a certain Solution of Verdigrease) so fitted for my
purpose, that though in other Glasses the Experiment would not succeed, yet
when that particular Glass was fill'd with that Solution, in the Body of
the Vial it appear'd of a Lovely Blew, and in the neck, (where the Light
did more dilute the Colour,) of a manifest Green; and though I suspected
there might be some latent Yellowness in the substance of the neck of the
Glass, which might with the Blew compose that Green, yet was I not
satisfi'd my self with my Conjecture, but the thing seem'd odd to me, as
well as to divers curious persons to whom it was shown.
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