_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 caecum 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. _Tests._--Soluble in water, but not in alcohol. 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. Dilute nitric acid gives a white precipitate, soluble in excess, and also in tartaric acid. Marsh's and Reinsch's processes are applicable for the detection of antimony, but Reinsch's is the better. Reinsch's process gives a violet deposit instead of the black, lustrous one of arsenic. =Chloride of Antimony= (Butter of Antimony).--A light yellow or dark red corrosive liquid. _Symptoms._--Violet corrosion and irritation of the alimentary canal, with the addition of narcotic symptoms. After death the mucous membrane of the entire canal is charred, softened, and abraded. _Treatment._--As for tartar emetic; magnesia in milk. XXIII.--MERCURY AND ITS PREPARATIONS The most important salt of mercury, toxicologically, is corrosive sublimate. Other poisonous preparations are red precipitate, white precipitate, mercuric nitrate, the cyanide and potassio-mercuric iodide. Calomel has very little toxic action. Metallic mercury is not poisonous, but its vapour is.