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1 "Manifestum est, radium Solis immissum cavæ nubi, repulsa acie in Solem, refringi."
2 Aristotle treats of the Rainbow much in detail, principally in his Meteor. iii. 2, 3, 4, and 5, where he gives an account of the phænomena, which is, for the most part, correct, and attempts to form a theory for them; see especially cap. 4. p. 577 et seq. In the treatise De Mundo he also refers to the same subject, and briefly sums up his doctrine with the following remark: "arcus est species segmenti solaris vel lunaris, edita in nube humida, et cava, et perpetua; quam velut in speculo intuemur, imagine relata in speciem circularis ambitiûs." cap. 4. p. 607. Seneca also treats very fully on the phenomena and theory of the Rainbow, in his Nat. Quæst. i. 3–8.
3 Vide supra, also Meteor. iii. 2, and Seneca, Nat. Quæst. i. 3.
4 Aristotle, Meteor. iii. 5. p. 581, observes, that the rainbow is less frequently seen in the summer, because the sun is more elevated, and that, consequently, a less portion of the arch is visible. See also Seneca, Nat. Quæst. i. 8. p. 692.
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