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I knew that the elder Herschel had by this means vastly advanced our knowledge of the heavenly bodies, indeed to an extent far beyond what had been achieved by the most perfect of glass lens instruments. Mr. Maudslay was interested in the idea I suggested; and he requested me to show him what I knew of the art of compounding the alloy called speculum metal.
All I did was to swing the lens about six inches, and shift the focus slightly, to secure two good exposures of her in fine positions. My caterpillar almost escaped while I worked, for it had put in the time climbing to the ground, and was a yard away hurrying across the grass at a lively pace.
This is about one fourth of an inch thick and one third of an inch through its long diameter, and is more curved on the back than on the front surface. Both the lens and the capsule are highly elastic. *Chambers and "Humors" of the Eyeball.*—The crystalline lens together with the suspensory ligament and the ciliary processes form a partition across the eyeball.
Duret was always at hand, either sharpening tools, or cleaning the anvil, or pasting maps; and the king employed him to fix the lens of the telescope so as to suit his majesty's eye; and there, in an arm-chair at the end of the telescope, sat the king, for hours together, spying at the people who thronged the palace courts, or who went to and fro in the avenue.
It was a wild, tempestuous night, towards the close of November. Holmes and I sat together in silence all the evening, he engaged with a powerful lens deciphering the remains of the original inscription upon a palimpsest, I deep in a recent treatise upon surgery. Outside the wind howled down Baker Street, while the rain beat fiercely against the windows.
He began by tearing from the germ letter the piece of gelatine and first examining it with a pocket lens. Then, with a sterile platinum wire, he picked out several minute sections of the black spot on the gelatine and placed them in agar, blood serum, and other media on which they would be likely to grow. "I shall have to wait until to-morrow to examine them properly," he remarked.
An instant later he was down on his hands and knees, carefully examining the interior by means of a pocket lens. "I think I have made a start," he remarked, rising to his feet and facing us with an air of satisfaction. We said nothing, and he pointed to some almost undiscernible marks in a thin layer of dust that had collected in the sarcophagus.
Quivering with excitement lest a sudden cloud should interpose, a moment passed before I could hold the lens steadily enough to concentrate a burning focus. At length it came. The little thread of smoke curled gracefully upwards from the Heaven-lighted spark, which, a few moments afterwards, diffused with warmth and comfort my desolate lodgings.
The impression of success exceeded the reality, and a historian writing some months afterwards declared that by the 29th "the Vimy Heights had been won": it required a considerable Canadian victory a year and a half later to give much substance to this claim, and most of the ground secured in September 1915, including the Givenchy Wood, La Folie, and Thelus, was found to be in German hands when the line from Lens to Arras was taken over by British troops.
The media of the eye are the crystalline lens, vitreous and aqueous humors. The crystalline lens is a transparent, biconvex body sustained by the ciliary processes. The vitreous humor is a transparent jelly-like substance that fills all the cavity of the eye posterior to the lens. The aqueous humor is a liquid, contained in the anterior and posterior chambers of the eye in front of the lens.
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