247. Properties of Ortho-, Meta-, and Para-Dinitro-Benzol, 189 248. Effects of Dinitro-Benzol, 189, 190 249. The Blood in Nitro-Benzol Poisoning, 191 250. Detection of Dinitro-Benzol, 192 XII. HYDROCYANIC ACID. 251. Properties of Hydrocyanic Acid, 192 252. Medicinal Preparations of Prussic Acid--Various Strengths of the Commercial Acid, 192, 193 253. Poisoning by Prussic Acid--Uses in the Arts--Distribution in the Vegetable Kingdom, 193-195 254. Composition and Varieties of Amygdalin, 195 255. Statistics of Poisoning by Prussic Acid, 195-197 256. Accidental and Criminal Poisoning, 197, 198 257. Fatal Dose, 198 258. Action of Hydric and Potassic Cyanides on Living Organisms, 198, 199 259. Symptoms observed in Animals, 199, 200 260. Length of Interval between taking the Poison and Death in Animals, 200, 201 261. Symptoms in Man, 201, 202 262. Possible Acts after taking the Poison--Nunneley’s Experiments, 202, 203 263. Chronic Poisoning by Hydric Cyanide, 203 264. _Post-mortem_ Appearances, 203, 204 265. Tests for Hydrocyanic Acid and Cyanide of Potassium--Schönbein’s Test--Kobert’s Test, 204-206 266. Separation of Hydric Cyanide or Potassic Cyanide from Organic Matters--N. Sokoloff’s Experiments, 206-208 267. How long after Death can Hydric or Potassic Cyanide be Detected? 208, 209 268. Estimation of Hydrocyanic Acid or Potassic Cyanide, 209 269. Case of Poisoning by Bitter Almonds, 209, 210 _Poisonous Cyanides other than Hydric and Potassic Cyanides._ 270. General Action of the Alkaline Cyanides--Experiments with Ammonic Cyanide Vapour, 210 271. The Poisonous Action of several Metallic and Double Cyanides-- The Effects of Mercuric and Silver Cyanides; of Potassic and Hydric Sulphocyanides; of Cyanogen Chloride; of Methyl Cyanide, and of Cyanuric Acid, 210, 211 XIII. PHOSPHORUS.