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Updated: July 8, 2025
The shield should be placed on the upper surface of the slide, so that the hole will cover the point where the light from the mirror enters the glass. With this illuminator Moeller's balsam test-plate is resolved with ease, with suitable objectives. Diatoms mounted dry are shown in a manner far surpassing that by the usual arrangement of mirror, particularly with large angle dry objectives.
In a vastly remote past, and for a vastly extended period, the mighty deep rolled over the surface of a world inform and void, depositing a sediment of its used up living tenants, the microscopic cases of foraminiferae, sponges, sea-urchins, husks, and the cast limbs of crustaceans. The descending shells of the diatoms like a subaqueous snow gradually buried the larger dejections.
The best rest is change of occupation. Hapley determined to plunge at diatoms, and had one of his smaller microscopes and Halibut's monograph sent down from London. He thought that perhaps if he could get up a vigorous quarrel with Halibut, he might be able to begin life afresh and forget Pawkins.
The species of Diatoms entering into this deposit have not yet been worked up, but they appear to be referable chiefly to the genera Fragillaria, Coscinodiscus, Choetoceros, Asteromphalus, and Dictyocha, with fragments of the separated rods of a singular silicious organism, with which we were unacquainted, and which made up a large proportion of the finer matter of this deposit.
This one medusa had in its stomach no less than seven hundred thousand diatoms, so that it would be rather difficult to compute how many the whole shoal consumed for their dinner they in their turn having to be eaten by the huge whales. I had during my voyages and travels ample proof of the truth of the remark, that different people see the same object in very different lights.
The best rest is change of occupation. Hapley determined to plunge at diatoms, and had one of his smaller microscopes and Halibut's monograph sent down from London. He thought that perhaps if he could get up a vigorous quarrel with Halibut, he might be able to begin life afresh and forget Pawkins.
He was a shy, lonely, rather ineffectual man, provided with just enough income to keep off the spur of necessity, and not enough nervous energy to make him seek any exacting employments. He might have collected stamps or coins, or translated Horace, or bound books, or invented new species of diatoms. But, as it happened, he grew orchids, and had one ambitious little hothouse.
But if the Radiolaria and Diatoms are thus rained upon the bottom of the sea, from the superficial layer of its waters in which they pass their lives, it is obviously possible that the Globigerinæ may be similarly derived; and if they were so, it would be much more easy to understand how they obtain their supply of food than it is at present.
Many substances so used are not sticky and let moisture in through the joints. Where a smooth surface is required, it is readily obtained by dusting on a little talc. It can also be given a coat of japan on the outside. American Electrician. HOW TO CLEAN DIATOMS. As a general rule, we may say that every specimen of diatomaceous earth or rock needs a special treatment.
I saved up this story; and, when the polypes asked if they hadn't done what they intended, I told them I didn't think it so very remarkable, for the tiny diatoms made cities, and were far more astonishing animals than they. I thought that would silence them; but they just turned round, and informed me that my diatoms were plants, not animals, so my story was all humbug.
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