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Updated: May 11, 2025
He uses arsenious acid gas, which gives the electricity a greenish tint. That mass of electricity becomes a perfect little cyclone. It is funnel-shaped and spins around like a top. When he moves the plate over a table, his cyclone catches up pennies, pens, pith balls and other small articles, and scatters them in every direction.
For example, in case of poisoning by arsenious acid, if hydrated peroxide of iron is administered, the destructive agency is instantly checked. Now this peroxide is known to combine with the acid, and form a compound, which, being insoluble, cannot act at all on animal tissues.
A piece of glass or porcelain held to the flame will have, if arsenic be present, a deposit on it having the following characters: In the centre a deposit of metallic arsenic, round this a mixture of metallic arsenic and arsenious acid, and outside this another ring of arsenious acid in octahedral crystals.
If no mark appears, the reagents are pure, and the suspected liquid may now be added. The hydrogen decomposes arsenious acid, and forms arseniuretted hydrogen. The gas carried off by a fine tube is again ignited.
And thus the proximate cause of the death produced by this description of poisons is ascertained, as far as the Method of Agreement can ascertain it. Let us now bring our conclusion to the test of the Method of Difference. And, first, “many insoluble basic salts of arsenious acid are known not to be poisonous.
It occurs as metallic arsenic, which is of a steel-grey colour, brittle, and gives off a garlic-like odour when heated; as arsenious acid; in the form of two sulphides the red sulphide, or realgar, and the yellow sulphide, or orpiment; and as arsenite of copper, or Scheele's green. It also exists as an impurity in the ores of several metals iron, copper, silver, tin, zinc, nickel, and cobalt.
Slightly soluble in cold water; 1 ounce of water dissolves about 1/2 grain of arsenic. Fowler's solution is the best-known medicinal preparation of arsenic, and contains 1 grain of arsenious anhydride in 110 minims. Symptoms. Commence in from half to one hour.
Among the experiments, it was observed that the yeast of cane-sugar solution produced no fermentation whatever when poisoned with a small quantity of arsenious acid; with oil of turpentine, and creasote, similar negative results were obtained.
For example, in case of poisoning by arsenious acid, if hydrated peroxide of iron is administered, the destructive agency is instantly checked. Now this peroxide is known to combine with the acid, and form a compound, which, being insoluble, can not act at all on animal tissues.
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