Manganic acid 381 Manganous salts 380 Marble 305 Marl 305 Marsh gas 202 Matches 242 Matte 358 Matter, classification 6 conservation 5 definition 5 kinds 9 Measurement of gases 23 Mechanical mixtures 6 Meerschaum 321, 336 Mercuric chloride 363 iodide 364 oxide 14, 362 sulphide 363 Mercurous chloride 363 Mercury 361 iodides 364 metallurgy 361 occurrence 361 oxides 362 uses 362 Metaboric acid 265 Metallurgy 268 Metals 165, 267 action on salts 271 definition 267 extraction 268 occurrence 267 preparation of compounds 269 reduction from ores 268 Metaphosphoric acid 245 Metarsenic acid 250 Metasilicic acid 261 Metastannic acid 371 Methane 202, 399 Methylamine 412 Mexican onyx 305 Mica 261, 336 Microcosmic salt 244 Milk 414 Minerals 267 Minium 375 Mixed salts 244 Molasses 413 Molecular weights 226 boiling-point method 233 compared with oxygen 228 determination 226 freezing-point method 233 oxygen standard 227 of elements 232 vapor-density method 229 Molecule 62 Molybdenum 388 Molybdic acid 388 Monazite sand 377 Mordants 333 Morphine 418 Mortar 304 Moth balls 418 Muriatic acid 182 Naphthalene 418 Naphthas 400 Nascent state 182 Natural gas 219 sciences 1 Neon 80 Neutralization 108 a definite act 109 definition 109 heat of 109 partial 111 Niagara Falls 269, 329 Nickel 354 coin 359 compounds 354 plating 354 Nicotine 419 Nitrates 131 Nitric acid, 128 action on metals 130 decomposition 129 oxidizing action 130 preparation 128, 140 properties 129 salts 131 Nitric oxide 133 Nitrites 132 Nitrobenzene 417 Nitrocellulose 415 Nitrogen 78 compounds 122 in air 87 occurrence 78, 122 oxides 132 preparation 78 properties 80 Nitroglycerin 409 Nitrosulphuric acid 155 Nitrous acid 132 oxide 132 Non-metals 165 Oil of myrbane 417 of vitriol 154 Oleic acid 408 Olein 409 Oleomargarine 410 Onyx 260 Opal 260 Open-hearth process 346 Opium 418 Ores 267 Organic bases 412 chemistry 201, 397 matter, decomposition 122 Orpiment 246 Orthoarsenic acid 250 Orthophosphates 244 Orthophosphoric acid 244 Orthosilicic acid 261 Osmic acid 393 Osmium 393 tetroxide 393 Oxalic acid 407 Oxidation 17, 353 definition 18 Oxidizing agent 37 Oxygen 13 and ozone 22 commercial preparation 16 history 13 importance 21 in air estimation, 85 in air function, 84 occurrence 13 preparation 13 properties 16 standard for atomic weights 66 two atoms in molecule 227 Oxyhydrogen blowpipe 37 Ozone 21, 137 Palladium 390 Palmitic acid 407 Palmitin 409 Paraffin 400 Paris green 250 Parkes's method for silver 364 Pearls 305 Perchloric acid 187 Periodic acid 194 Periodic division 166 groups 167 law 169 law, imperfections 172 law, value 171 table 168 table, arrangement 166 Permanent hardness 310 Permanganates 381 Permanganic acid 381 Peroxides 278 Petroleum 399 Pewter 372 Phenol 417