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We are not yet in a condition to grapple with it, but we shall be by-and-by. Meanwhile we may profitably glance back on the web of relations which these experiments reveal to us. We have, firstly, in solar light an agent of exceeding complexity, composed of innumerable constituents, refrangible in different degrees.
It was shown that the merest trace of soluble haloid would reverse an image by the extraction of bromine from it, and the fact that the most refrangible part of the spectrum was principally efficacious in completing this action showed how necessary it was to avoid falling into error when analyzing photographic action by the spectroscope.
The meridian or evening light makes a difference in the colours of some spectra; for as the sun descends, the red rays, which are less refrangible by the convex atmosphere, abound in great quantity.
When you say that the blood circulates, that the air is heavy, that the sun's rays are pencils of seven refrangible rays, you are not either of the sect of Harvey, or the sect of Torricelli, or the sect of Newton; you agree merely with the truth demonstrated by them, and the entire universe will ever be of your opinion.
The most reflexible rays are the most refrangible, and from hence he evinces that the same power is the cause both of the reflection and refraction of light. But all these wonders are merely but the opening of his discoveries.
To overcome the difficulty arising from the chromatic aberration, the optician has only to employ a combination of lenses of opposite focal length, and cut from glass possessing different refrangible powers, so that the rays of light passing through the one are strongly refracted, and in the other are bent asunder again, reproducing white light.
And the more refrangible the light the greater is the amount of twisting; so that, when white light is employed, its constituent colours are thus drawn asunder. Placing the quartz plate between the polarizer and analyzer, this vivid red appears; and, turning the analyzer in front from right to left, the other colours of the spectrum appear in succession.
And so the true cause of the length of that image was detected to be no other than that LIGHT consists of RAYS DIFFERENTLY REFRANGIBLE, which, without any respect to a difference in their incidence, were, according to their degrees of refrangibility, transmitted towards divers parts of the wall."
Hence, as the less refrangible colours grew more intense when the more refrangible ones were introduced, we are forced to conclude that side by side with the introduction of the shorter waves we had an augmentation of the amplitude of the longer ones. These remarks apply not only to the visible emission examined by Dr.
The lightning flashed in vivid darts, which seemed to play along the sides of the pass, until the attractive adamant deviated the refrangible fluid; which then buried itself in some deep crevice of the pendent rocks. A few heavy drops of rain then fell to the earth, and were speedily succeeded by a deluge, which was driven on the face of a tempest almost irresistible.
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