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Updated: May 9, 2025
The witness took the paper and examined it attentively, first with the naked eye and then with a pocket-lens. "I see," said he, "two blood-marks and a print, apparently of a thumb. Of the two marks, one is a blot, smeared slightly by a finger or thumb; the other is a smear only. Both were evidently produced with quite liquid blood. The thumb-print was also made with liquid blood."
No man in England is a finer judge of gems than my brother-in-law. I watched him narrowly. He examined them close, first with the naked eye, then with the little pocket-lens which he always carries. "Admirable imitation," he muttered, passing them on to Amelia. "I'm not surprised they should impose upon inexperienced observers."
In this, and in many similar discussions, in which exact mineralogical knowledge was required, it is remarkable how successful Darwin was in making out the true facts with regard to the rocks he studied by the simple aid of a penknife and pocket-lens, supplemented by a few chemical tests and the constant use of the blowpipe.
From it emerges the tertiary larva, which, from a simple examination with the pocket-lens, appears to me, in its general features, identical with the secondary larva, the one which eats the Tachytes' provisions. It is naked and pale-yellow, the colour of butter. It is active and wriggles with awkward movements. Ordinarily it lies upon its side, but it can also stand in the normal position.
Indeed, once the contest is opened, the Philanthus becomes so entirely absorbed in her operation that I can remove the cover and follow every vicissitude of the tragedy with my pocket-lens. After recognizing the invariable position of the wound, I bend back and open the articulation of the head.
When April came, my Sitaris-larvæ began, as usual, to bestir themselves. The first Bee to appear, an Osmia, is dropped alive into a glass jar containing a few of these larvæ; and after a lapse of some fifteen minutes I inspect them through the pocket-lens. Five Sitares are embedded in the fleece of the thorax. It is done, the problem's solved!
It was felled to procure a section for exhibition, and thus an opportunity was given to count its annual rings of growth. The colossal scarred monument in the King's River forest mentioned above is burned half through, and I spent a day in making an estimate of its age, clearing away the charred surface with an ax and carefully counting the annual rings with the aid of a pocket-lens.
By the light of the station lamps and the aid of a pocket-lens, Kennedy examined them on the outside and satisfied himself that after being replaced in the wooden cases the bottles themselves had not been handled. "Will you let me borrow some of these bottles to-night" he asked the agent. "I'll give you my word that they will be returned safely to-morrow. If necessary, I'll get an order for them."
Now a skilled eye, aided by a pocket-lens, can make out very minute details on a cheque or bank-note; but it is not possible to lend one's skilled eye to a judge or juryman, so that it is often very convenient to be able to hand them a photograph in which the magnification is already done, which they can compare with the original.
I unswung my pocket-lens, the infant of the microscope, and my whole being followed my eyes; the trees and sky were eclipsed, and I hovered in mid-air over four glistening Mars-like planets seamed with radiating canals, half in shadow from the slanting sunlight, and silhouetted against pure emerald. The sculpturing was exquisite.
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