Physics Reports vol.73

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Calomel was formed and carbon deposited. A very minute bubble of gas was produced, but it was much too small to interfere with the conclusions drawn respecting the binary nature of the compound; and was probably caused by air that had adhered to the sides of the tube when the mercury was poured in. The most perfect demonstration that the body contains no hydrogen, and indeed of its nature altogether, is obtained from the circumstances which attend its formation. When the fluid compound of chlorine and olefiant gas is acted on by chlorine and solar light in close vessels, although the whole of the chlorine disappears, yet there is no change of volume, its place being occupied by muriatic acid gas.

The vapour of the perchloride of carbon readily detonates by the electric spark with a mixture of oxygen and hydrogen gases; but the gaseous results are very mixed and uncertain, from the near equipoise of affinities that exists among the elements. Sulphur readily unites to it when melted with it, and the mixture crystallizes on cooling into a yellowish mass. When heated more strongly, the substance rises unchanged, and leaves the sulphur unaltered; but when the mixed vapours are raised to a still higher temperature, chloride of sulphur and protochloride of carbon are formed.

Some crystals of calomel were introduced into ammoniacal gas; they immediately blackened on the surface, and gas was absorbed. The action appeared to be exactly similar to that exerted when calomel is thrown into solution of ammonia. A black substance is produced, which though repeatedly washed in distilled water, gives off ammonia by heat, and calomel with a little mercury sublimes. A piece of fused chloride of lead exerted but little action in a fortnight; a small quantity of gas was absorbed, and a very superficial combination had been formed.

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