=Arseniuretted Hydrogen= (arsine, AsH_{ 3}) is an extremely poisonous gas, and is evolved in various chemical and manufacturing processes. When damp, _Ferro-silicon_ evolves AsH_{ 3} and PH_{ 3}, both very lethal gases. _Ferrochrome_ is used in making steel, and it also evolves PH_{ 3}, and in such extreme dilution as 0.02 per cent. may cause death.
=Tartar Emetic= (tartarized antimony, potassio-tartrate of antimony) occurs as a white powder, or in yellowish-white efflorescent crystals. Vinum antimoniale contains 2 grains to a fluid ounce of the wine.
_Symptoms._--Metallic taste, rapidly followed by nausea, incessant vomiting, burning heat and pain in stomach, purging. Dysphagia, sense of constriction in throat, intense thirst, cramps, faintness, profound depression; in fatal cases, giddiness and tetanic spasms. In _chronic poisoning_, nausea, vomiting and purging, weak pulse, loss of appetite, debility, cold sweats, great prostration, progressive emaciation. The symptoms in chronic poisoning may simulate gastritis or enteritis. Externally applied, it produces an eruption not unlike that of smallpox.
_Post-Mortem Appearances._--Inflammation, softening, and an aphthous condition of the throat, gullet, and stomach, the last reddened in patches. In chronic poisoning, inflammation also of cæcum and colon. Brain and lungs may be congested. Decomposition is hindered for long.
_Treatment._--Promote vomiting by warm greasy water, or the stomach-tube may be used. Cinchona bark or any preparation containing tannin, as tea, decoction of oak bark, etc. Morphine to allay pain.
_Fatal Dose._--In an adult 2 grains (same as arsenic).
_Fatal Period._--Death follows in eight to twelve hours, from exhaustion.
_Method of Extraction from the Stomach._--The contents of the stomach or its coats should be finely cut up and boiled in water, acidulated with tartaric acid and subjected to dialysis, or strained and filtered. Pass hydrogen sulphide through the filtered or dialyzed fluid until a precipitate ceases to fall; collect the sulphide thus formed, wash and dry it. Boil the orange-coloured sulphide in a little hydrochloric acid. If the solution be now added to a large bulk of water, the white oxychloride is precipitated, which is soluble in tartaric acid and precipitated orange yellow with hydrogen sulphide. The chloride of bismuth is also precipitated white, but the precipitate is not soluble in tartaric acid, and the precipitate with hydrogen sulphide is black.