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Updated: May 9, 2025
As a general rule, quartz, in a compact or amorphous state, forms a vitreous mass, serving as the base in which feldspar and mica have crystallised; for although these minerals are much more fusible than silex, they have often imprinted their shapes upon the quartz. This fact, apparently so paradoxical, has given rise to much ingenious speculation.
It required an enormous effort, the sound was at once all but imperceptible and burdened with an agony of labor. As he watched her he saw what, he thought, was an illusion the blueness of the room, of the walls, seemed to settle on her countenance. It increased, her face was in tone with the color that had so disturbed her, a vitreous blue too intense for realization.
She looked up in surprise, and saw his eye resting on her with what seemed like a mist of sympathy on its vitreous surface. Her lips trembled, parting as if for speech but she looked away without answering. "These new devices for keeping people alive," Mr. Tredegar continued; "they increase the suffering besides prolonging it?" "Yes in some cases." "In this case?" "I am afraid so."
He says: "The mound rises abruptly to the height of 198 feet, and has on its summit a compact mass of brickwork 37 feet high by 28 broad.... On one side of it, beneath the crowning masonry, lie huge fragments torn from the pile itself. The calcined and vitreous surface of the bricks, fused into rock-like masses, show that their fall may have been caused by lightning.
The skin in front of the future eye becomes depressed, the depression increases and assumes the form of a sac, which changes into the aqueous humour and lens. An outgrowth of brain substance, on the other hand, forms the retina, while a third process is a lateral ingrowth of connective tissue, which afterwards changes into the vitreous humour of the eye.
They have sometimes a little ornament in a hard white or cream 'slip' which stands up above the surface of the vase. These fabrics are all for table use, or for tomb-furniture, and are usually of small size. H. Pottery with vitreous glaze like modern earthenware only appears on Byzantine and Turkish sites.
Earthenware was used for holding wine, oils, and other liquids; but the finest production of the potter were the vases, covered with a vitreous glaze and modelled in every variety of forms, some of which were as elegant as those made later by the Greeks, who excelled in this department of art.
Often whalemen have found themselves cruising nigh that burning mountain when all aglow with a ball-room blaze. Or, rather, glass-works, you may call this same vitreous isle of Narborough, with its tall chimney-stacks. Where we still stand, here on Rodondo, we cannot see all the other isles, but it is a good place from which to point out where they lie.
This is the case, too, with all the red marbles of Italy, which, in spite of their compact character, scale off very readily, and are friable, vitreous, and full of cleavage planes, in addition to which they are usually only found in thin beds, which prevents their being used for other purposes than table-tops and flooring-slabs.
It is met with exclusively in the central nervous system, retina, and optic nerve. It is a slowly growing, soft, ill-defined tumour, which displaces the adjacent nerve centres and nerve tracts, and is liable to become the seat of hæmorrhage and thus to give rise to pressure symptoms resembling apoplexy. The glioma of the retina tends to grow into the vitreous humour and to perforate the globe.
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