If
turning your back to the Window, you powr out some of the Liquor towards
the Light and towards your Eyes, it will seem at the comming out of the
Glass to be perfectly Caeruleous, but when it is fallen down a little way,
the drops may seem Particolour'd, according as the Beams of Light do more
or less fully Penetrate and Illustrate them. If you take a Bason about half
full of Water, and having plac'd it so in the Sun-beams Shining into a
Room, that one part of the Water may be freely illustrated by the Beams of
Light, and the other part of it Darkned by the shadow of the Brim of the
Bason, if then I say you drop of our Tincture, made somewhat strong, both
into the Shaded and Illuminated parts of the Water, you may by looking upon
it from several places, and by a little Agitation of the water, observe
divers pleasing Phaenomena which were tedious to particularize. If you powr
a little of this Tincture upon a sheet of White Paper, so as the Liquor may
remain of some depth upon it, you may perceive the Neighbouring drops to be
partly of one Colour, and partly of the other, according to the position of
your Eye in reference to the Light when it looks upon them, but if you powr
off all the Liquor, the Paper will seem Dy'd of an almost Yellow Colour.
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