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It may even be several minutes before the field of vision really appears black, that is, before the activity of the inner light in the choroid has so far died away that equilibrium prevails between the non-stimulated nerves and the non-stimulated blood. With this insight into the twofold nature of the process of vision we are now able to describe more fully the negative after-image.
In such a case we see the contrasting colour as coloured after-image. Only by representing the process in this way do we do justice to a fact which completely eludes the onlooker-consciousness namely, that the eye produces the contrasting colour even while it is still exposed to the influence of the outer colour.
While Hopalong's eyes left the scrambled color-insult and tried to banish the horrible after-image, his mind groped for the rules of etiquette governing free fist fights in gospel tents, and while he hesitated as to whether he should dent the classic profile of the color-bearer or just twist his nose as a sign of displeasure, the voice of the evangelist arose to a roar and thundered out.
Man may be surrounded by agencies which savages exaggerate, and which science disregards altogether, and these faculties and agencies may point to an element of truth which is often cast aside as a survival of superstition, as the 'after-image' of an illusion.
If we wished to abuse language so much as to speak of will in an "Absolute" where change is excluded, so that nothing can be or be conceived beyond it, we might say that the Absolute willed everything that ever exists, and that the eternal order terminated in every fact indiscriminately; but such language involves an after-image of motion and life, of preparation, risk, and subsequent accomplishment, adventures all pre-supposing refractory materials and excluded from eternal truth by its very essence.
Still, the display that followed for an enchanted hour or so was such as I find it hopeless to describe in language which shall convey to others the beauty and splendour of what I saw. I picked up a book lying on the table before me. A pale blue-violet shadow floated across the page before me, leaving an after-image of pure colour that was indescribable. I laid down the book and closed my eyes.
The meaning of the scheme was clear. Jacqueline was on Captain Duhamel's boat, which sailed at nine. And only twenty minutes remained to me. If I had not had the good luck to meet Dubois! I must have noticed a clock somewhere during the minute that I was in the château, and though I had not been conscious of it, the after-image loomed before my eyes.
The train had always entered the clangorous colon of the city before this resolve could crystallize in his mind, and he was left with an impression which lay somewhere in the scale of reality between the after-image of a light bulb and the morning memory of a fever-dream.
To whichever of these six colours one exposes the eye, an after-image always appears of its contrast colour, forming with it a pair of opposites. We must here briefly recall how this phenomenon is generally explained on Newtonian lines. The starting-point is the assumption that the eye becomes fatigued by gazing at the colour and gradually becomes insensitive to it.
Hence in the parts of the eye adapted to darkness we experience the faint brightness as strongly luminous, even dazzling, whereas in the parts more adapted to light we feel the same degree of brightness to be dark. That the action of the inner light is responsible for the differences becomes clear if, while the negative after-image is still visible, we darken the eye with the hollowed hands.
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