Of Light and Colours.

Perpendicular PE, are Red , and make these d Part of the Spectrum at R; the nextar e the Orange at O, the Yellow at Y, theQreen at G, the Blue at B, the Indigo at I,at *d the Violet at V : And these Seven arethe original Jimple Colours in Nature *a Nd of which, by various Mixtures, allot hers are compounded, in the commonRefractions and Reflections from naturalbodies (CXVIII).

Since

jj* e Light will be wholly reflected from one Surface of‘"e Glass to the other; and never let out into the Air ;Whence it follows, that though the Particles of Matterj? Bodies be in themselves - transparent, yet if they are0 disposed one among another as to reflect the Lightobliquely, ’tis plain, the Light in such a case will® lost by various Reflections within the Body, and"Us prove a Cause of the Body’s Opacity.

(, (CXVIII) I. This different Refrangibility of thepjtps Light proceeds from hence, that the Particles of^'ght are of different Degrees of Magnitude ; for ifPower act upon a Body, so as to give it a particu-Determination or Direction of Motion, that Deter-mination or Direction of the Body’s Motion will always^ the fame, while the Energy of the Power and theHi>antity of Matter remain the fame, and will be va-"hle in Proportion as either of these is so.

, But the refracting Power of the Medium will bejj^ys the fame while it is homogeneous or all of onet i° rt of Matter, therefore when a Ray of Light pastes5 r °ugh a Substance of Water, Glass, Crystal, is'c. and^ifferent Direction of Motion is thereby communicateddift'e rent p art s of the Ray, it follows, that the Particlest jjkh constitute those Rays, which have a different Di-- ^ion ? ipust be among themselves unequal in Quantity

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