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It takes about five and a half pounds for a room of 3,500 cubic feet capacity. The process is sure and quite economical, since sulphide of carbon is sold at about five cents per pound, which amounts to 25 cents for a room of 3,500 cubic feet capacity. The burner costs ten dollars, but may be used for an almost indefinite period.
Then the chance present of a little scientific toy invented by Sir William Crookes, a toy called the spinthariscope, on which radium particles impinge upon sulphide of zinc and make it luminous, induced him to associate the two sets of phenomena. It was a happy association for his inquiries.
She had no earthly reason to connect him with Dudley's death, except the scraps of conversation she had overheard from Paulette and me; she knew nothing of the bottle of wolf dope that had been meant to smash in my wagon, or that Dudley so full up with drink and drugs that he could not have smelled even that mixture of skunks and sulphide could easily have been sent out reeking with it, into bush that reeked of it too.
As a case in point, let us suppose that the water in one lode contained in solution carbonates of lime, and the alkalies and silica derived form a decomposition of felspars; and that the other, charged with hydro-sulphuric acid, brought with it sulphide of gold dissolved in sulphide of lime.
Heated in substance, it crepitates and chars; and if heat be increased, the metal is deposited. Treated with sulphuretted hydrogen, a characteristic orange-red sulphide is formed. A drop of the solution evaporated leaves crystals, either tetrahedric, or cubes with edges bevelled off. Sulphuretted hydrogen passed through gives the orange-red precipitate above named.
"I never cared particularly for hydrogen sulphide and sulphur dioxide, either," he assured her, "but they aren't strong enough to hurt us in the short time we'll be here. Those Titanian chemists know their stuff, though." He opened the outer valves slowly, then opened the door and they stepped down upon the smooth, solid floor, which Stevens examined carefully. "I thought so, from his story.
A remarkable feature of this region, besides its great agricultural possibilities, is that the surface exposure in the hillsides shows distinct mineral-bearing horizons, beds of zinc carbonates, whose promise of zinc sulphide at a greater depth is absolutely reliable.
Automatic fire was made from equal parts of sulphur, saltpetre, and sulphide of antimony, finely pulverized and mixed into a paste, with equal parts of juice of the black sycamore and liquid asphaltum, a little quick-lime being added. It was directed to keep the material from the rays of the sun, which would set it on fire.
A pistol that has been shot off has potassium sulphide from the powder in the barrel. Later, it oxidizes and iron oxide is found. This weapon has neither the sulphide nor the oxide, as far as I can determine. It has never even been discharged. No, it was not the pistol found on Forbes that figured in this case. "As far as that new-fangled gun goes, Forbes, it was a frame-up.
The sodium arsenite may be prepared from pure arsenious oxide, as described below, and is stable for considerable periods; but commercial oxide requires resublimation to remove arsenic sulphide, which may be present in small quantity.
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