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    Dry assay 172     Wet method 173   CHAPTER X. COPPER, LEAD, THALLIUM, BISMUTH, ANTIMONY. Copper—Introductory 175     Dry assay 176     Valuation of copper ores 181     Wet methods 183         (1) Electrolytic assay 184     Volumetric methods 194         (1) Cyanide method 194         (2) Iodide method 199         (3) Colorimetric method 203     Examination of commercial copper 205 Lead 211     Dry assay 211     Wet assay 213         (1) Gravimetric method 213         (2) Volumetric method 214         (3) Colorimetric method 218 Thallium 219 Bismuth 220     Dry assay 221     Wet method 221         (1) Gravimetric determination 222         (2) Colorimetric assay 223 Antimony 225     Dry assay 225     Wet method 227         (1) Gravimetric assay 228         (2) Volumetric method 229   CHAPTER XI. IRON, NICKEL, COBALT, ZINC, CADMIUM. Iron 231     Gravimetric determination 233     Permanganate and bichromate methods 234     Stannous chloride method