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Accordingly, he had taken a preliminary Treatise on Mineralogy in hand, and puzzled his brains in order to converse learnedly. "My land," quoth he, "is Silesia, and has a great bed of sulphuret of pyrites."
A crisis was at last developed by the gift of a friend who sent them some lumps of "Sulphuret Potass" which the boys heated, when a strange and still stranger odor arose. Absorbed in their experiments, they heard neither approaching footsteps nor voices; the door was even opened, but quickly shut.
In the first case are sulphurets of copper, and copper iron; in the second case are the series of sulphurets of lead, or galena, from various parts of the world; in the third case are specimens of sulphuret of bismuth, needle ore, or sulphuret of bismuth, copper, and lead, and sulphurets of mercury, or cinnabar, chiefly from Spain, the light variety of which is the bright vermilion used by artists; in the fourth case are the sulphurets of silver, the beautiful crystallised sulphurets of antimony, chiefly from Transylvania, and the delicate plumose antimony, or feather ore; in the fifth case are the sulphur salts, including the ruby, silver, &c.; and in the sixth case are the sulphurets of Arsenic, red orpiment, of which the best comes from Persia, cobalt glance, &c., bringing the series of sulphurets to a conclusion.
Stir the fused mass, so as to expose all its parts freely to the atmosphere, whereby it passes from the state of a sulphuret, by the absorption of atmospheric oxygen, into that of a sulphite, with the phenomenon of very slight incandescence. Dissolve in water, filter the solution, and boil it immediately along with flowers of sulphur.
The iron in water from old coal pits and shale deposits is usually present as sulphate due to the oxidation of pyrites, a sulphuret or sulphide of iron. Water from heaths and moorlands is often acid from certain vegetable acids termed "peaty acids." This acidity places the water in the condition of a direct solvent for iron, and that dissolved iron may cause great injury.
Another and less dangerous source of these specks is organic matter contained in the solution employed in dissolving the chemicals, or the water in washing. Much of the hyposulphite of soda in market contains a sulphuret, which, coming in contact with the silver surface, immediately causes oxidation.
Herbert found a vein of it at the foot of Mount Franklin, and they had nothing to do but purify this salt. These different works lasted a week. They were finished before the transformation of the sulphuret into sulphate of iron had been accomplished.
It is abundant in sulphur, iron, and manganese ores, and sulphuret of mercury: but rare in gypsum, chalk, calcareous and silicious earths. Any attempt to extract iodine economically should be made with the plants of the ferro-iodureted fresh waters. Most of the bodies regarded by the therapeutists as pectoral and anti-scrofulous are rich in iodine.
It has a soft, depressed body, spiny beneath at the base of the legs and on the thorax. One or both of the two posterior pairs of feet bear suckers, and all are more or less covered with long, slender hairs. This insect may be destroyed by the same remedies as are used for lice and for the human itch. The best remedy is probably a solution of sulphuret of potassium.
All slates, and this fact is very important, contain nearly five per cent of potash, sulphuret of iron, peroxide of iron, carbon, etc. The contact of so many moistened heterogeneous substances must necessarily lead them to a change of state and composition.
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