Page:Philosophical Transactions - Volume 002.djvu/180

 Numb. 30.

SIR,

perform now the promise I made you the other day, I must acquaint with you with what will perhaps somewhat surprise you, by giving you an Account of what I tried on Tuesday night last (Octob. 29. 1667.) and the two or three following nights, about the Relation between Air and Light, as this is to be found in some Bodies.

The occasion of these Trials was this: Having, as you know, long since made some Notes, chiefly Historical, upon particular Qualities, and finding Light to be (how justly, I now dispute not) reckon'd by the generality of Philosophers among Qualities, I handled together what Observations I had either made by my self, or received from some ingenious Travellers (to whom I recommend my Enquiries) about Shining Bodies; and had also prepared several Trials about them, to be made when I should have opportunity, and requisite Instruments to put them in

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