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I am told that this appearance is "due to layers of air of different degrees of refracting power, in motion, relative to one another. Air at different temperatures will refract light differently." In Hampshire this phenomenon is known by the pretty name of "the summer dance." Since I came to the Forest I have seen two very curious and, I think, unusual natural appearances.
Both pupillary openings should be the same size, and not too small or too large in the bright light. As we look through the pupillary openings, both the lens and the vitreous humor should refract the light properly and not appear white or greenish-white in color. The color of the iris should be noted. If it lacks lustre or appears dull, this may indicate an inflammation.
Think what it must mean to view the world, the institutions of society, moral ideas, and human character with an absolutely unprejudiced mind! We Americans are skinful of prejudices. Of course we don't call them prejudices; we call them principles. But they sometimes impress others as prejudices; and they no doubt help to obscure our judgment, and to shorten or refract our sight.
Why is the egg, already enclosed in the secrecy of the ovaries, already luminous? "The soft light of the Agaric has confounded our ideas of optics; it does not refract, it does not form an image when passed through a lens, it does not affect ordinary photographic plates." But here are other miracles:
At the point where we can barely see to work; that is, when the fourth-order rays will be so retarded that they can no longer carry the heterodyned light waves without complete distortion, we shall stop automatically, as the material at that depth will have the required density to refract the fifth-order rays to the correct degree." "How can our foundations stand it?" asked Seaton.
That is what I am wondering about." "Here, sir," removing the thick disk from around the light. "This contains the prisms, which refract the beam entirely around the lamp; and disperse it into the seven colors of the spectrum.
If the sanctity is radiant, the glow is intense enough to refract the light, to cast a shadow, to be photographed, even caught with the physical eye. I was relating the experience of the Columbian. In his case there had been much time, so there could be no mistake. He had devoted himself to making and keeping a rather magnificent set of muscles which manifested even through white man's clothing.
But 'siliceous dust' will not wholly account for the veiling of the sun and the opaqueness of the higher atmosphere. This arises simply from the want of humidity; the air is denser, and there is no vapour to refract and reflect the light-rays.
There are rings of bishops and kings; jeweled baubles from Egyptian tombs and gold-wrought ornaments of the Montezumas; a cameo where a single face with its shadows makes six laughing and six weeping outlines; a cat's-eye quartz to which the one the king of Siam has is perhaps the mate; diamonds and pearls, amethysts and topazes, beryls and opals, single emeralds of rare beauty and doublets of great size, rubies of the real pigeon's blood, and sapphires whose heart is blue as the bluest midnight, but whose angles refract a radiance red as fire; chains of carved beads; seals, intaglios, to almost all of them some legend attaching.
The looking-glass is intended to remind believers that the Supreme Being can see their innermost thoughts as clearly as they can perceive their own reflection; while the crystal ball is an emblem of purity. Great store is set by the latter, especially if of large size and without flaw; but to my mind the imperfect ones are the best, as they refract the light and do not look so much like glass.
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