Sulphuretted hydrogen 192 Carbon bisulphide 193 Cyanogen compounds 195 Group: Arseniuretted hydrogen and carbonic oxide (blood poisons) 197 Group: Hydrocarbons of the aliphatic and aromatic series and their halogen and hydroxyl substitution products 202 Sub-group: Hydrocarbons of mineral oils and their distillation products (benzine, paraffin, &c.) 202 Sub-group: Hydrocarbons of the aromatic series 204 Benzene and its homologues 204 Naphthalene 208 Sub-group: Halogen substitution products of the aliphatic series (narcotic poisons) 208 Sub-group: Halogen substitution products of the benzene series 209 Sub-group: Hydroxyl substitution products of the fatty series 210 Group: Nitro- and amido-derivatives of the aliphatic and aromatic series 211 Sub-group: Nitro-derivatives of the aliphatic series 212 Sub-group: Nitro- and amido-derivatives of the aromatic series 212 Turpentine, pyridene, alkaloids, nicotine, poisonous woods 215 Part III.—Preventive measures against industrial poisoning