, 169
Daniell cells, 185
Didymium, 319
Dollars to the ton, 9
Dry assays, 16
Drying, 5, 33
Earths, 314
the alkaline, 320
Electrodes, 187
Electrolysis for copper, 184
for nickel, 254
Equations, 69
Erbia, 319
Ferrous and ferric salts, 231
Filtration, 31
Finishing point, 42
Flasks, graduated, 49
Flatting, 149
Fluorine and fluorides, 363
Fluxes, 16, 93, 136, 138, 140
Formul?, 68
Furnaces, 25
Galena, lead in, 217, 218
Gangue, 405
iron in the, 244
Gas-measuring apparatus, 52
Gases, measurement of, 44
Gay-Lussac's assay for silver, 119
assay for silver modified, 123
German silver, copper in, 194
nickel in, 255, 259
Gold, 126
amalgamation of, 126
in cyanide liquor, 140
loss of, in cupellation, 145
loss of, in parting, 154
preparation of, 63
silver in, 157
silver in, after parting, 154
test for, 126
Gold-lead alloys, cupellation of, 142
sampling of, 158
Gold ores assay with cyanide solutions, 141
calcination of, 139
concentrates, 140
fluxing, 136, 138, 140
sampling of, 127
size of assay charges, 127
tailings, 140
Gold-parting, 150
platinum in, 145, 154, 170, 171
Gold-zinc slimes, 142
Graduated vessels, 49
Gravimetric methods, 15, 27
Halogens, 358
Hardhead, 287
an analysis of, 289
Hot plate, 30
Hydrogen, preparation of, 62
reduction by, 280
Hydrometer, 77
Ignition, 32
in hydrogen, 280
Indicators, 42
Inquartation, 146
Iodine and iodides, 362
Iridium, 171
Iron, 231
bichromate assay for, 237, 243,
carbon in, 423
colorimetric assay for, 247
ferrous and ferric, 231
gravimetric determination, 233
permanganate assay for, 236, 238
phosphorus in, 399
reduction of ferric solutions, 235, 241
separation of, 232
stannous chloride assay for, 244
volumetric assays for, 234
Iron ores, iron in, 244, 247
phosphates in, 399
Laboratory books, 9
Lanthanum, 319
Lawrence Smith's method for alkalies, 333, 412
Lead, 211
colorimetric assay for, 218
detection of, 211
dry assay for, 211
gravimetric determination of, 213
in commercial copper, 206
in commercial zinc, 214
in galena, 217, 218
separation of, 211, 213
volumetric determination of, 214
Litharge, use of, in dry assays, 20, 93
Lithium, 338
Lime, 320
milk of, 321
volumetric assays for, 322
Limestone, examination of, 329
lime in, 324
Limewater, 321
Loths, 9
Magnesia, magnesium, 328
mixture, preparation of, 64
Manganese, 298
colorimetric assay, 306
detection of, 299
gravimetric determination of, 300
separation of, 299
volumetric determination of, 300
Manganese peroxide, ferrous sulphate assay for, 301
iodine assay for, 302
= manganese dioxide, 298
Manganese ore, copper in, 204
manganese in, 300
peroxide in, 302
Matte, 18
Measuring, 49
flasks, 49
gases, 44, 52
gold buttons, 133, 440,
liquids, 49
silver buttons, 106
Mechanical methods, 16
Mercury, 171
dry assay, 172
wet assay, 173
Metallic particles in ores, gold, 129
particles in ores, silver, 108
particles, tin, 278, 287
Micrometer, 133
Microscope, measuring with the, 440, 133
Mispickel, arsenic in, 125, 392
sulphur in, 376
Moisture, 7, 350
Molybdate separation for phosphates, 395
solution, preparation of, 60
Molybdenum, 311
Muffle, 25
Nessler's solution, 342
Nickel, 251
dry assay for, 251
electrolytic assay, 254
gravimetric determination of, 254
in German silver, 255, 259
separation from cobalt, 254, 258, 442
separation from iron, 258
separation from manganese, 258
separation of, 253
volumetric assay, 255
Niobium, 297
Nitre, 22
use of, in dry assays, 95
Nitrogen and nitrates, 400
Nitrometer, 403
Normal acid, normal solutions, 323
Ores, determining water in, 5, 351
drying, 5
powdering, 4, 109, 130, 448
quantities of, for an assay, 11, 27, 127
sampling, 1, 127, 444
with metallic particles, 3, 108, 129
Osmiridium, 171
Osmium, 171
Ounces to the ton, long, 107
to the ton, short, 132
Oxidation, 345
Oxides, 345
determination of oxygen in, 346
Oxidising agents, 22, 95, 345
effect of nitre, 95
effect of nitric acid, 56
Oxygen, 344
equivalent, 358
in natural waters, 344, 356
in ores, 348
Palladium, 171
Parting, 150
acids, 150
in flasks, 151
in glazed crucibles, 153
in special apparatus, 156
in test tubes, 152
Phosphate, assay of apatite for, 399
assay of iron ore for, 399
Phosphates, gravimetric assay, 396
volumetric assay, 397
Phosphorus and phosphates, 394
in iron, 399
Pipette, 50, 120
Platinum, 170
in gold, 145, 154, 170
Potash, commercial examination of, 338
Potassium, 336
gravimetric determination, 337
Potassium cyanide, 22, 65, 160
commercial assay of, 167
commercial, purity of, 161
Powdering, 4, 130, 448, 109
Precipitation, 30
Precipitates, drying, 32
igniting, 32, 34
washing, 31
Preliminary assays, 104, 147
Preparation of acids, 54
of other reagents, 59
Prill, 108, 129, 278, 287
Produce, 8
Pyrarsenate of magnesia, 383
Pyrites, iron in, 244
sulphur in, 370, 376
Pyrophosphate of magnesia, 397
Quantity to be taken for an assay, 11, 27, 127
Quartation, 146
Quartering, 2
Reagents, strength of, 54
Red lead for dry assays, 20, 22, 94
Reducing agents, 21, 94
effects of charcoal, &c.
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