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One only had to take the predominating hue of a picture, and note the complementary or similar colours, to establish experimentally what variations would occur; for instance, red would turn yellowish if it were near blue, and a whole landscape would change in tint by the refractions and the very decomposition of light, according to the clouds passing over it.
But rays of light pass through it in another fashion and produce those marvellous refractions the causes of which I am now going to try to explain; reserving for the end of this Treatise the statement of my conjectures touching the formation and extraordinary configuration of this Crystal.
Two such lenses mounted with axes parallel and with curvatures varying in opposite directions produce a compound cylindrical lens, whose refraction in the direction of the axes is zero, and whose refraction in the meridian at right angles to this is at any point the sum of the refractions of the two lenses.
He shows us God, instead of our own false conceptions of Him, which are but distorted refractions of His true likeness. Only within the limits of Christ's revelation is there knowledge of God, as distinguished from guesses, doubtful inferences, partial glimpses. Elsewhere, the greatest certitude as to Him is a 'peradventure'; Jesus alone says 'Verily, verily. Jesus makes us able to see God.
We must look through the depths of their experience into their own souls, and through the depths of that experience again upon the world, beholding it as it appears to the beggar, and the lonely woman, and the child of vice and crime, and the hero, and the saint, and as it falls with intense yet diverse refractions upon all these multiform angles of personality.
It is thus that we shall in the first place explain the refractions which occur in the air, which extends from here to the clouds and beyond. The effects of which refractions are very remarkable; for by them we often see objects which the rotundity of the Earth ought otherwise to hide; such as Islands, and the tops of mountains when one is at sea.
I need scarcely add that Salvator was no less renowned as a poet and musician than as a painter. His genius was revealed in magnificent refractions.
It appeared under an angle of 0 degrees 16 minutes 35 seconds; which in a distance estimated at sixty miles would give the mica-slate group of Macanao the elevation of about 660 toises, a result which, in a zone where the terrestrial refractions are so unchanging, leads me to think that the island was less distant than we supposed.
It gives, at most, certain acute points, certain salient aspects. I begin to realize for the first time how thin and suggestive and sketchy a thing any novel or biography must be. How we must simplify! How little can we convey the fullness of life, the glittering interests, the interweaving secondary aspects, the dawns and dreams and double refractions of experience!
All the coronae were evidently produced by the fog; my shadow was impressed on the surface of the sea." The cause of these phenomena is "the reflection of the sun's rays, decomposed by different refractions in minute globules of water, of which the mist, wherein the coronae occur, in a great measure appears to consist." Mock suns, or parhelia, are common appearances in northern skies.
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