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He took the hint and maintained silence while they climbed down from the truck and approached the door of the building. It swung open as they approached. As they entered a strong garlic-like smell was evident. The hum of heavy machinery smote their ears. They were led down a corridor to a flight of steps. On the floor below they went along another corridor to a heavy iron-studded door.
The earliest signs are a garlicky taste in the mouth and pain in the throat and stomach. Vomited matter luminous in the dark, bile-stained or bloody, with garlic-like odour. Great prostration, diarrhoea, with bloody stools. Harsh, dry, yellow skin, purpuric spots with ecchymoses under the skin and mucous membranes, retention or suppression of urine, delirium, convulsions, coma, and death.
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.
Put the substance to be tested into a flask with some small pieces of bread, sterilize for half an hour at 120° C. When cold, inoculate with a culture of Penicillium brevicaule, and keep at a temperature of 37° C. If arsenic is present, a garlic-like odour is noticed in twenty four hours, due to arseniuretted hydrogen or an organic combination of arsenic.
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