concentrick Circles of Rays after their transmission, falling on a white Paper, will make concentrick Rings of red upon the Paper, supposing the Light which passes through one single globule, strong enough to be sensible. And, in like manner, the Rays of other # Colours willmake 'Rings of other Colours. Suppose now that in a fair Day the Sun mines through a thin Cloud of such globules of Water or'Hail, and* that the globules are all of the fame bigness; and the Sun seen through this Cloud (hall appear encompassed with the like concentrick Rings of Colours, and the Diameter of the first "Ring of red (hall be jl. Degrees, that of the second 10 T Degrees, that of the third 12 Degrees 33 Minutes. And accordingly as the Globules of Water are bigger or less, the Rings {hall be less or bigger. This is the Theory, and Experience answers it. For in June 1692, I saw by reflexion in a Vessel of stagnating Water three Halos, Crowns, or Rings of Colours about the Sun, like three little Rain-bows, concentrick to his Body. The Colours of the first or innermost Crown were blue next the Sun, red without, and white in the middle between the blue and red. Those of the second Crown were purple and blue within, and pale red without, and green' in the middle. And those of the third were pale blue within, and pale red without j these Crowns enclosed one another immediately, so that their Colours proceeded in this continual order from the Sun outward: blue, white, red; purple, blue, green, pale U yellow yellow and red; pale blue, pale red. The Diameter of the second Crown measured from the middle of the yellow sand red on one side of the Sun, to the#middle of the same Colour on the other side was 9 s Degrees, or thereabouts. The Diameters of the first and third I had not time to measure, but that of thS first seemed to be about five or six Degrees, and that of the third about twelve. The like Crowns appear sometimes about the Moon; for in the beginning of the Year 1664, Feb. 19th at Night, I saw two such Crowns about her. The Diameter of the first or innermost was about three Degrees, and -that of the se~* cond about five Degrees and an half. Next about the Moon was a Circle of white, and next about that the inner Crown, which was of a bluish green within next the white, and of a yellow and red without, and next about these Colours were blue and green on the inside of the outward Crown, and red on the outside of it. At the fame time there appeared a Halo about 22 Degrees 35' distant from the center of the Moon. It was elliptical, and its long Diameter was perpendicular to the Horizon, verging below farthest from the Moon. I am told that the Moon has sometimes three or more concentrick Crowns of Colours encompassing one another next about her Body. The more equal -the globules of Water or Ice are to one another, the more Crowns of Colours will appear, and the Colours will be the more lively. The Halo at the distance of 22 T Degrees from |