[16] or PROPOSITION S.L PROP. I. THEOR. I. O IGHTS that dissent in color, dissent dissent in Degrees of Refrangibility: The Proof by Experiments. Isaac Newton to Exper. I. I took a black rectangular rectangular Paper terminated by Parallel Sides, and with a Per- pendicular right Line drawn croſs from one Side to the opposite, diftinguiſhed it into 2 e- qual Parts. one amongst one amongst I painted with a red color and also the alternative with a blew. The Paper was terribly black, and also the and also the and thickly ordered on, that the Phænomenon might be may be. This Paper I view'd through a Priſm of folid Glaſs, whoſe two Sides through that the sunshine the sunshine the Eye were plane and well poliſhed, and contained an Angle of concerning fixty degrees : that Angle I decision the refracting Angle of the Prifm. And whilſt I view'd it, I command it and also the and also the a Window in ſuch manner that the perimeters of the Paper were parallel to t...
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