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But I have in my possession the most undoubted proof of this kind. It is a mineral vein, or cavity, in which are blended together coal of the most fixed kind, quartz and marmor metallicum. Nor is this all; for the specimen now referred to is contained in a rock of this kind, which every naturalist now-a-days will allow to have congealed from a fluid state of fusion.
When the disease first appeared in the city, we furnished the families which we were accustomed to attend, and all others who desired them, with Veratrum album and Cuprum metallicum, which had been earnestly recommended by Homoeopathic physicians elsewhere, who had had experience in treating the disease, as preventive remedies, a dose or two of each to be taken daily.
It happens singularly enough, that a curious old work, Aldrorandus, Musaeum Metallicum, Bologna, 1613, contains drawings of a knife and wooden mask ornamented with mosaic-work of stone, made just in the came way as those described above, and only differing from them in the design. What became of them I cannot tell.
Here, for example, are crystallised together in one mass, 1st, Pyrites, containing sulphur, iron, copper; 2dly, Blend, a composition of iron, sulphur, and calamine; 3dly, Galena, consisting of lead and sulphur; 4thly, Marmor metallicum, being the terra ponderosa, saturated with the vitriolic acid; a substance insoluble in water; 5thly, Fluor, a saturation of calcareous earth, with a peculiar acid, called the acid of spar, also insoluble in water; 6thly, Calcareous spar, of different kinds, being calcareous earth saturated with fixed air, and something besides, which forms a variety in this substance; lastly, Siliceous substance, or Quartz crystals.
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