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Careful dissolving of the pyrites and gangue so as to leave the gold intact failed to find it in any larger diameter. As this was a very unusual experience in investigations on many other kinds of pyrites, I was led further into the matter. "Ultimately, after a number of experiments, there was nothing left but to test for gold existing as a natural sulphide.
"Didn't ask! It looked like gin, and it smelt like a sulphide factory when it got on my clothes. They certainly had that bottle." "Well, Skunk's Misery hasn't got this bottle, anyhow!" I could see no reason for the look on her face. It was not gay any more; it was stern, if a girl's face can be stern, and it was white with angry suspicion. Suddenly she laughed, rather fiercely.
Dissolve 3 grams of sodium bicarbonate in 200 cc. of water in a 500 cc. beaker, and pour the cold solution of the antimony chloride into this, avoiding loss by effervescence. This is usually expelled by the heating upon the water bath; but if it is not wholly driven out, a point is reached during dilution at which the antimony sulphide, being no longer held in solution by the acid, separates.
"If the temperature goes down, the sulphide of carbon will crystallize," said Balthazar, continuing to give forth shreds of indistinct thoughts which were parts of a complete conception in his own mind; "but if the battery works under certain conditions of which I am ignorant it must be watched carefully it is quite possible that Ah! what am I thinking of?
In 1896, something like a year after the discovery of the X-ray, Niewenglowski reported to the French Academy of Sciences that the well-known chemical compound calcium sulphide, when exposed to sunlight, gave off rays that penetrated black paper.
By means of a magnifying glass, a screen covered with sulphide of zinc is kept under observation, and in front of it is disposed, at a distance of about half a millimetre, a fragment of some salt of radium. We then perceive multitudes of brilliant points on the screen, which appear and at once disappear, producing a scintillating effect.
"This sample came from the lode at the 140 ft. level, whilst samples from the higher levels where the ore is more oxidised, although carrying the gold in exactly the same degree of fineness, do not give as high a percentage of auric sulphide.
The matter is vividly expressed in a letter, given below, which I received from an officer wounded in the Nieuport attack: "I was gassed by dichlor-diethyl sulphide, commonly known as mustard stuff, on July 22nd. Going up we met a terrible strafe of H.E. and gas shells in Nieuport. When things quietened a little I went up with the three G.S. wagons, all that were left, and the carrying parties.
When sulphite wood pulp is to be prepared, the chips are conveyed from the chipper into hoppers in the upper part of the building. Here they are thrown into great upright iron boilers or digesters charged with lime-water and fed with the fumes of sulphur which is burned for the purpose in a furnace adjoining the building and which thus forms acid sulphide of lime.
An adherent coating may be obtained by adding an alkaline tartrate, but in that case the separation takes place too slowly. The precipitation of antimony may be very readily effected from solutions of its sulpho salts. To a liquid, which may contain free hydrochloric acid, hydrogen sulphide is added, then neutralized with ammonium hydrate, and saturated with ammonium sulphide in excess.
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