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Updated: May 25, 2025
If monochromatic light be used, these bands are simply bright and dark, but with white light the circles display iris-colours. If a slit be shortened so as to form a square aperture, we have two series of spectra at right angles to each other. The effects, indeed, are capable of endless variation by varying the size, shape, and number of the apertures through which the point of light is observed.
Pliny speaks of painters who painted in one or two colors; and, as respects the angelic characters, Milton does so; he is monochromatic. So, and for reasons resting upon the same ultimate philosophy, were the mighty architects of the Greek tragedy. They also were monochromatic; they also, as to the characters of their persons, painted in one color.
They have succeeded in photographing the sun's surface in monochromatic light, such as the light given off as one of the bright lines of hydrogen or of calcium, by means of the "Spectroheliograph." The spectroscope is placed with its slit in the focus of an equatoreal telescope, pointed to the sun, so that the circular image of the sun falls on the slit.
Vetchen bestowed largess upon the small, freckled boy attendant; and his distinguished disapproval upon the largest lady-crocodile which, with interlocked but grinning jaws, slumbered under a vertical sun in monochromatic majesty. "One perpetual and gigantic simper," he said, disgusted.
Here, in fact, we resolve the wave-motion into its elements, and having succeeded in doing this we shall have no great difficulty in applying our knowledge to optical phenomena. Now let us return to our slit, and, for the sake of simplicity, we will first consider the case of monochromatic light.
Now the spectroscope offers the means of indefinitely weakening atmospheric glare by diffusing a constant amount of it over an area widened ad libitum. But monochromatic or "bright-line" light is, by its nature, incapable of being so diffused. It can, of course, be deviated by refraction to any extent desired; but it always remains equally concentrated, in whatever direction it may be thrown.
They come from seed, when this is taken from striped individuals, and thence revert from time to time to the corresponding monochromatic type. But whether they would do so when self-fertilized, and whether the reversionary individuals are always bound to return towards the center of the group or towards the opposite limit, remains to be investigated.
The experiments were conducted during five generations with the violet, and during four with the striped Clarkia, including the progeny of the striped and of the monochromatic red offspring of a primitive striped plant.
Whistler bores me with his monochromatic mud; I don't like dull colours, dull sounds, dull intellects; and anything called 'an arrangement' on canvas, or anything called 'a human document' or 'an appreciation' in literature, or anything 'precious' in art, or any author who 'weaves' instead of writes his stories all these irritate me when they do not first bore me to the verge of anæsthesia."
Porphyry, I have heard, runs through as large a gamut of hues as marble; but, if this should be an exaggeration, at all events porphyry is far from being so monochromatic as Gibbon's argument would presume. The truth is, colors were as loosely and latitudinarially distinguished by the Greeks and Romans as degrees of affinity and consanguinity are everywhere.
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