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To understand properly the campaign in the Artois, it is necessary to have at least a fair knowledge of the geography and the topography of the territory between La Bassée and Arras. The valley of the Scarpe is held in on the south by low hills, and on the north by a low plateau, which descends in long ridges to the valley of the Lys and the plains about Lens.
Our photographer, arrived at the lake with a grievous burden of camera, plates, tripod, etc., found that he had forgotten his lens tubes, and was compelled to double his tracks back to the canoes, then wade out into the swampy borders of the lake, waist-deep in slime, to secure a view of this highest Mississippi water, only to have his plate light-struck and ruined by an accident on the homeward journey.
In him were received the imaginations, the inventions, the aspirations, the superstitions, the humors, the supernatural intimations; in him met the converging rays of the genius of his age, as in a lens, to be sent onward thenceforth in an ever-broadening stream of light.
Although the most striking modern discoveries are in the field which was opened to us by the lens in its manifold applications, it is in the chemist's laboratory that we find that branch of science, long cultivated, but rapidly advanced only within the last two centuries, which has done the most for the needs of man.
Singularly enough, the idea here mentioned does not appear to many so absurd as it is in reality. It is known that the image formed by the large lens of an ordinary telescope or the large mirror of a reflecting telescope is a real image; not a merely virtual image like that which is seen in a looking-glass.
"While you're in Saranac," said Craig, "buy me a dozen or so test-tubes. Only, don't let anyone here at the house know you are buying them. They might ask questions." While they were gone Kennedy stole into James Langley's room and after a few minutes returned to our room with the hunting-jacket. He carefully examined it with his pocket lens.
The flaw in the diamond, the alloy in the gold, the stain in the purple, the blot upon the ermine all these are detected upon the instant; the value of the jewel is decreased, the price of the metal is deteriorated, the glory of the hue is tarnished, the purity of the mantle is sullied; and where minor imperfections may pass unperceived, a mighty social lens is for ever bearing upon the great.
For several days the Galaxy behind them had been dwindling from a mass of stars down to a huge bright lens; down to a small, faint lens; down to a faintly luminous patch. At the previous cast of the detector it had still been visible as a barely-perceptible point of light in the highest telescopic power of the visiplate.
The story of myself and Mary is a mere incident in that gigantic, scarce conscious effort to get clear of toils and confusions and encumbrances, and have our way with life. We are like little figures, dots ascendant upon a vast hillside; I take up our intimacy for an instant and hold it under a lens for you. I become more than myself then, and Mary stands for innumerable women.
The lower powers of the compound microscope are but available for the examination of signatures for the reason that when the higher powers are used but little of the signature is in the field of vision, although the power of the lens may be increased when some particular point or feature in the writing requires greater enlargement for more perfect definition.
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