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It spreads the sensitive film on the artificial retina which looks upon us through the optician's lens for a few seconds, and fixes an image that will outlive its original.
The retina contains curious structures which can be seen only with the aid of the microscope. For instance, a layer near the choroid is made up of nerve cells arranged in innumerable cylinders called "rods and cones," and packed together not unlike the seeds of a sunflower.
We cannot see the world as God means it, save in proportion as our souls are meek. In meekness only are we its inheritors. Meekness alone makes the spiritual retina pure to receive God's things as they are, mingling with them neither imperfection nor impurity of its own.
And inversely, representations approached from the point of view of pure vision, the mosaic of colour on the retina, if pushed far enough, may satisfy the mental perception of form with its touch associations. And of course the two points of view are intimately connected. You cannot put an accurate outline round an object without observing the shape it occupies in the field of vision.
Heatherbloom looked toward the vessel and his pupils dilated. The light leaped into the air with the motion of the naphtha, and, in an instant was gone, but the impress of a single detail remained on his retina of a side ladder, lowered, no doubt, for the woman, and not yet hoisted into place on the big boat. The wildness of the sea seemed to surge through Mr.
I know an expert on Japanese pottery who, when a sixth sense tells him that two pots apparently identical come really from different kilns, puts them behind his back and refers the matter from his retina to his finger-tips. Thus alternately challenged and trusted, the eye should become extraordinarily expert. A Florentine collector once saw in a junk-shop a marble head of beautiful workmanship.
His work, published about the year 1100 A.D., had great celebrity throughout the mediaeval period. The original investigations of Alhazen had to do largely with optics. He made particular studies of the eye itself, and the names given by him to various parts of the eye, as the vitreous humor, the cornea, and the retina, are still retained by anatomists.
Again she saw his great shoulders heave with unnecessary strength at the ridiculous cracker box; again she caught the sense of confinement with a machine of crushing strength and power. It seemed to her that her retina still danced with the impression of him as he turned to face her, as he flashed upon her like a drawn weapon.
In the mollusc, on the contrary, the retina is derived from the ectoderm directly, and not indirectly by means of the embryonic encephalon. Quite different, therefore, are the evolutionary processes which lead, in man and in the Pecten, to the development of a like retina.
Hence, when, the reverse spectrum of any colour became faint, it was wonderfully revived by admitting more light through the eyelids, by removing the hand from before them: and hence, on covering the closed eyelids, the spectrum would often cease for a time, till the retina became sensible to the stimulus of the smaller quantity of light, and then it recurred.
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