- There can no Homogeneal Colours be reduced out of Light by Refraction, which were not commixt in it before. Because by Prop.
- and 8. Refraction changeth not the Qualities of the Rays, but only separates those which have
divers Qualities, by means of their different Refrangibility.
- The Sun's Light is an Aggregate of an indefinite variety of Homogeneal Colours, by Prop. 1, 3, and 9. And hence it is, that I call Homogeneal Colours also Primitive or Original. And thus much concerning Colours.
For a further Illustration of this Doctrine, Mr. Newton, in his Book of Opticks lately published, has by undeniable Experiments explained most of the Principal Phænomena of Light and Colours: To which we refer the Reader.
A Demonstration concerning the Motion of Light, communicated from Paris .
PHilosophers have been labouring for many Years to decide by some Experiment, whether the Action of Light be conveyed in an instant to distant Places, or whether it requireth time. M. Romer, of the Royal Academy of Sciences, hath devised a way taken from the Observations of the first Satellit