CHEMICAL INDUSTRY 1 Sulphuric acid industry (sulphur dioxide): use of sulphuric acid 4 Its effects on health 9 Hydrochloric acid, saltcake and soda industry 14 Their effects on health 20 Use of sulphate and sulphide of soda 22 Ultramarine 22 Sulphonal 22 Diethyl sulphate 23 Chlorine, chloride of lime and chlorates 23 Their effect on health 26 Other chlorine compounds and their use as well as bromine, iodine and fluorine 29 Chlorides of phosphorus 30 Chlorides of sulphur 31 Zinc chloride 32 Rock salt 32 Organic chlorine compounds 32 Carbon oxychloride (phosgene) 32 Carbon chlorine compounds (aliphatic) 33 Methyl chloride 33 Methylene chloride 34 Carbon tetrachloride 34 Ethyl chloride 34 Monochloracetic acid 34 Chloral 34 Chloroform 34 Chloride of nitrogen 35 Cyanogen chloride 35 Chlorobenzene 35 Benzo trichloride, benzyl chloride 35 Nitro- and dinitro-chlorobenzene 35 Iodine and iodine compounds 36 Bromine and bromine compounds 36 Methyl iodide and methyl bromide 36 Fluorine compounds 37 Hydrofluoric and silicofluoric acids 38 Manufacture and uses of nitric acid 39 Its effect on health 40 Nitric and nitrous salts and compounds 44