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At Vesuvius also, we perceive small crystals of vitreous feldspar only in the very ancient lavas of the Somma. These lavas, setting aside the leucite, very nearly resemble the phonolitic ejections of the Peak of Teneriffe.
They contain large crystals of feldspar, which are not fissured, and seldom vitreous. When the basis of the lavas of the Malpays changes from pitchstone to obsidian, its colour is paler, and is mixed with grey; in this case, the feldspar passes by imperceptible gradations from the common to the vitreous.
The typical glaucomatous field in the acute cases shows a defect most pronounced to the nasal side. The field in a simple glaucoma is apt to approach concentric limitation; namely, more like the field in simple atrophy. This is consistent with the fact that simple glaucoma in many cases possesses the characteristics of glaucoma plus atrophy of the optic nerve. Vitreous.
Hazlitt, for example, somewhat lacked this force, and hence De Quincey is justified to speak of his solitary flashes of thought, his "brilliancy, seen chiefly in separate splinterings of phrase or image, which throw upon the eye a vitreous scintillation for a moment." One of the charms, in a high sense, of Coleridge's page is that in him this dynamic force was present in liveliest action.
The experiments of M. da Camara, and those I made in 1802, tend to support the opinion, that the pumice-stones adherent to the obsidians of the Peak of Teneriffe do not unite to them accidentally, but are produced by the expansion of an elastic fluid, which is disengaged from the compact vitreous matter.
Thence he went over sideways and toppled to the floor, where he lay twitching, a huddle of arms and legs, the head lolling sideways, the eyes vitreous, and blood, blood, blood all about him. The sight turned me almost physically sick. I faced about, and sprang from the room out into the ante-chamber, where a battle was in progress.
And he ended by distinguishing Laveuve's white, worn, sunken, deformed head. Here, on a human face, appeared all the ruin following upon hopeless labour. Laveuve's unkempt beard straggled over his features, suggesting an old horse that is no longer cropped; his toothless jaws were quite askew, his eyes were vitreous, and his nose seemed to plunge into his mouth.
After another year passed in this new pursuit, experimenting on every imaginable substance glass, gems, flints, crystals, artificial crystals formed of the alloy of various vitreous materials in short, having constructed as many varieties of lenses as Argus had eyes I found myself precisely where I started, with nothing gained save an extensive knowledge of glass-making.
Those that cause obstruction of the filtration angle by advancement of the iris and lens, as occurs when the volume of the contents of the vitreous chamber is increased, as from retinal or chorioidal hemorrhage or neoplasm. The various changes are so numerous that they need not be described further here. The ultimate changes due to high tension resemble those already described. Dr.
There is the ever-recurring miracle of the full moon rising, before day is dead, behind San Giorgio, spreading a path of gold on the lagoon which black boats traverse with the glow-worm lamp upon their prow; ascending the cloudless sky and silvering the domes of the Salute; pouring vitreous sheen upon the red lights of the Piazzetta; flooding the Grand Canal, and lifting the Rialto higher in ethereal whiteness; piercing but penetrating not the murky labyrinth of rio linked with rio, through which we wind in light and shadow, to reach once more the level glories and the luminous expanse of heaven beyond the Misericordia.
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