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Boyle, Robert, 1627-1691

"Experiments and Considerations Touching Colours (1664)"


And if a sheet of Paper with some of this Liquor in it be plac'd in a
window where the Sunbeams may shine freely on it, then if you turn your
back to the Sun and take a Pen or some such slender Body, and hold it
over-thwart betwixt the Sun and the Liquor, you may perceive that the
Shadow projected by the Pen upon the Liquor, will not all of it be a vulgar
and Dark, but in part a curiously Colour'd shadow, that edge of it, which
is next the Body that makes it, being almost of a lively Golden Colour, and
the remoter verge of a Caeruleous one.
[16] _Nicolaus Monardes_ lib _simplic. ex India allatis_, cap. 27.
These and other Phaenomena, which I have observ'd in this delightfull
Experiment, divers of my friends have look'd upon not without some wonder,
and I remember an excellent Oculist finding by accident in a friends
Chamber a fine Vial full of this Liquor, which I had given that friend, and
having never heard any thing of the Experiment, nor having any Body near
him that could tell him what this strange Liquor might be, was a great
while apprehensive, as he presently after told me, that some strange new
distemper was invading his Eyes. And I confess that the unusualness of the
Phaenomena made me very sollicitous to find out the Cause of this
Experiment, and though I am far from pretending to have found it, yet my
enquiries have, I suppose, enabled me to give such hints, as may lead your
greater sagacity to the discovery of the Cause of this wonder.


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