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This refracts the light a little more than it would be refracted by a membrane in which no such swelling existed, and not only so, but, in combination with the humors, it corrects the errors of dispersion and makes the image somewhat more colorless. All the young animals that have this swelled membrane see more distinctly than their parents or brethren.
I found myself within a dimly-lighted room, where the main illumination was refracted in a ghostly fashion from the white ceiling, and came from the street-lamps in the square below. I closed the door behind me, and found that I had light enough to make my way about without difficulty.
Causing the decomposed beam to pass through a second similar prism, but so placed that the colours are refracted back and reblended, the perfectly white luminous disk is restored. In this case, refraction and dispersion are simultaneously abolished. Are they always so? Can we have the one without the other? It was Newton's conclusion that we could not.
In moonlight I have seen these sandhills, a few miles away, shining like snowy mountains, being refracted to an unnatural altitude by the bright moonlight. Fortunate indeed it was for Eyre that such relief was afforded him; he was unable to penetrate at all into the interior, and he brought back no information of the character and nature of the country inland.
But it was not permitted me to see the nature of these temples, only I was informed that the light of their sun is let in by apertures amongst the branches, and is everywhere transmitted through crystals; whereby the light falling on the walls is refracted in colours like those of the rainbow, particularly blue and orange, of which they are fondest.
Here he finds that an eye, having a crystalline lens placed between the humors, not only refracts the light more than it would be refracted by the humors alone, but that, in this combination of humors and lens, the colors are as completely corrected as in the combination of Dollond's telescope.
Newton has very well proved by experiment, I will yet not desist from relating the invention, since it offers itself, so to speak, of itself, and because it further confirms our Theory of refraction, by the agreement which here is found between the refracted ray and the reflected ray. Besides, it may occur that some one in the future will discover in it utilities which at present are not seen.
He desired further that "note might be taken of this declaration as record of his good and upright intentions." But the sincerest and most upright intentions may be refracted by party atmosphere from their aim, and the purest gold from the mint elude the direct grasp through the clearest fluid in existence.
Friendship might thus be called ideal sympathy refracted by a human medium, or comradeship and sensuous affinity colouring a spiritual light.
"But what other kind of light can be used?" I asked, in answer to his mention of ordinary light. "Invisible light," he answered. "I do not mean the Röntgen ray, nor the emanation from radium, both of which are invisible, but neither of which is light, in that neither can be reflected nor refracted.
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