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Nature overcomes it, by a contrivance as simple as it is beautiful. In the operation of seeing, admitting the canvass or background of our picture to be a retina, or what we will, with a multiplicity of colours depicted upon it, we maintain that we cannot stop here, and that we never do stop here.
Her tone of conviction gave me a strong impression what she was looking like, and made an image of her flash across my retina. By which I mean, flash across the hole I used to see through when I had a retina. It was almost as strong and life-like as real seeing. But I knew it wasn't." "But how how how?" cried Gwen, excited. "How did you know that it wasn't?" "Because of the very white hair.
While we continue to look upon these luminous objects, their central parts gradually appear paler, owing to the decreasing sensibility of the part of the retina exposed to their light; whilst, at the same time, by the unsteadiness of the eye, the edges of them are perpetually falling on parts of the retina that were just before exposed to the darkness of the night, and therefore tenfold more sensible to light than the part on which the star or candle had been for some time delineated.
But I will rather observe, that not only when a man receives a great stroak upon his eye, or a very great one upon some other part of his head, he is wont to see, as it were, flashes of lightning, and little vivid, but vanishing flames, though perhaps his eyes be shut: But the like apparitions may happen, when the motion proceeds not from something without, but from something within the body, provided the unwonted fumes that wander up and down in the head, or the propagated concussion of any internal part in the body, do cause about the inward extremities of the Optick Nerve, such a motion as is wont to be there produc'd, when the stroak of the Light upon the Retina makes us conclude, that we see either Light, or such and such a Colour: This the most ingenious Des Cartes hath very well observ'd, but because he seems not to have exemplifi'd it by any unobvious or peculiar observation, I shall indeavour to illustrate this doctrine by a few Instances.
It does not know the path of the wave in our nerves; it does not suspect, for example, that the image of the objects is reversed in the retina, or that the excitements of the right eye for the most part go into the left hemisphere. In a word, it is no anatomist.
In other words, a succession of blows or wave vibrations of a certain kind affects the ear and we call it sound, just as a succession of other wave vibrations affects the retina and we have sight. If a moving picture moves slower than a certain number of pictures a minute you see the separate pictures; faster it is one moving picture.
Now it is probable, that the acting fibres of the ultimate terminations of the secreting apertures of the vessels of the testes, are as fine as those of the retina; and that they are liable to be thrown into that peculiar action, which marks the sex of the secreted embryon, by sympathy with the pleasurable motions of the nerves of vision or of touch; that is, with certain ideas of imagination.
They go to and fro in regular order, exactly like the fashionable folk in Rotten Row, but the two ranks pass so quickly that looked at both together the vision cannot separate them, they are faster than the impression on the retina.
The sensibility of its retina must have been as instantaneous as that of those conjurors who recognize a card merely by a rapid movement in cutting the pack or by the arrangement only of marks invisible to others. The Frenchman indeed possessed in the highest degree what may be called "the memory of the eye." The Englishman, on the contrary, appeared especially organized to listen and to hear.
The optical apparatus of the eye gathers some of these together, and gives them such a course that they impinge upon the surface of the retina, which is a singularly delicate apparatus, connected with the termination of the fibres of the optic nerve.
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