Mineral Poisons 209 Class I. CORROSIVE POISONS 210 _Arsenic_ 210 Arsenious acid, or white oxide of arsenic 212 1. Symptoms of poisoning by the Arsenious acid 216 Symptoms of the first degree 216 Symptoms of the second degree 217 Different modes of poisoning by the Arsenious acid 220 Physiological action of Arsenious acid 223 Organic lesions discovered on dissection 225 Of the Chemical processes by which the presence of Arsenious acid may be detected 232 1. The Arsenic is in a solid form 232 A. By its reduction to the metallic state 233 B. By the application of certain re-agents, or tests, to its solution 240 2. The arsenious acid is mixed with various alimentary and other substances 252 Arsenic acid, and its salts 256 The sulphurets of arsenic 257 _Mercury_ 257 Corrosive sublimate 257 Symptoms of poisoning by corrosive sublimate 259 1. Symptoms which follow a large dose 260 2. Symptoms which are produced by the repetition of small doses 260 Physiological action of Corrosive Sublimate 262 Antidotes to Corrosive Sublimate 263 Organic lesions discovered on dissection 266 Of the Chemical processes for its detection 267 _a._ By its metallization through the agency of Galvanism 268 _b._ By precipitating metallic mercury from its solution, by the contact of a single metal 269 3. It is dissolved in various coloured liquids 272 4. It is mixed or combined with some medicinal body in a solid form 273 5. It is united with alimentary substances which have effected its decomposition 274 6. It is decomposed, and a part exists in intimate combination with the membranes of the alimentary canal 274