Dowson and Mond gas 82 Suction gas 83 Acetylene (calcium carbide) 85 Their effect on health 87 Ammonia and ammonium compounds 90 Use of ammonia and its effects 92 Cyanogen compounds 93 Use of cyanide, and their effects 95 Coal tar and tar products 96 Their effects on health 101 Artificial organic dye stuffs (coal tar colours) 107 Their effects on health 112 RECOVERY AND USE OF METALS 120 Lead poisoning in general 120 Lead, silver and zinc smelting 122 Spelter works 125 Lead poisoning in lead smelting and spelter works 126 White lead and other use of lead colours 131 Lead poisoning in the manufacture and use of white lead and lead paints 132 Manufacture of electric accumulators 134 The ceramic industry 135 Coarse ware pottery 136 Manufacture of stove tiles 137 Stoneware and porcelain 138 Lead poisoning in letterpress printing 138 Lead poisoning in filecutting, polishing precious stones, musical instrument making, &c. 140 Mercury (poisoning in its recovery and use) 141 Mercurial poisoning in water-gilding, coating mirrors, in felt hat making, &c. 142 Arsenic (poisoning in its recovery and in use of arsenic and arsenic compounds) 143 Recovery of arsenic and white arsenic 143 Poisoning by arseniuretted hydrogen gas 145 Antimony 146 Extraction of iron 146 Ferro-silicon 149 Zinc 151 Copper, brass (brassfounders’ ague) 151