Kekulé, Friedrich August, 23, 113, 114, 121, 123, 125, 153 Kiliani, 165 Kipping, 147 Kirchhoff, 21 Knorr, 128, 151, 159 Koenigs, 133 Kohlrausch, 182, 183 Komppa, 129 Kopp, 172 Körner, 127 Krüss, 40 Krypton, 43, 50 Krystallin, 3 Kundt, 46 Laar, 149 Lactic acid, spatial representation of, 141 Ladenburg, 127, 134, 147, 161 Lamy, 35 Landolt, 78, 184 Langlet, 49 Larmor, Sir J., 184 Lauder, 151 Laurent, 79 Le Bel, 143, 147, 148 Leduc, 80, 81 Le Royer, 8 Leucol, 133 Liebermann, 162 Liebig, Justus von, 5 Linnemann, 127 Liquid diffusion, 16 Liquids, molecular volumes of, 172 Lossen, 172 Lowry, 151, 183 Low temperature research, 97, 39 Lutecium, 89 Magenta, 4 Magnus, 79 Maleic acid, 146 Mansfield, 3 Marignac, 39, 75 Mauve, 4 Maxwell, 83 Medlock, 3 Mellitic acid, 7 Membranes, semi-permeable, 176 Mendeléeff, 30, 102, 109, 183 Mercury forms a monatomic gas, 71, 92 Metaphosphoric acid, 14 Meyer Lothar, 103 Meyer, Victor, 67, 147 Mitscherlich, 63, 138 Moissan, 33 Molecule, integral, 62 Molecules, their number, 93 their size, 93 Monium, 40 Morley, 80 Morphine, 137 Mosander, 39 Multirotation, 145 Muscarine, 161 Muspratt, 4 Mutarotation, 145 Naphthalene, 163 Narceïne, 136 Narcotine, 136 Nasini, 184 Natanson, 157 Neodymium, 39 Neon, 43, 50 Neoytterbium, 38 Neurine, 161 Newlands, 102 Nicotine, 135, 162 Nilson, 37, 40, 107 Nirvanine, 160 Nitrogen compounds, stereo-isomerism of, 147 Novocaïne, 160 Odling, 30, 114 Oil of wintergreen, 162 Olszewki, 96 Opianic acid, 136 Organic synthesis, 152 Orthoforms, 160 Osmotic pressure, 176 Ostwald, 182 Oxyhæmoglobin, 167 Ozone, 70 its symbol, 70 Papaverine, 136 Partial pressure, law of, 173 Pasteur, 139 Peachey, 148 Pelopium, 26 Penny, 75 Periodic law, 101 Perissads, 116 Perkin, Sir William, 3, 129, 131, 132, 162 Pettenkofer, 30 Pfeffer, 176, 185 Phenacetin, 159 Phenylglycin, 163 Phosphorous oxide, molecular weight of, 73 Phosphorus pentachloride, 66 Phosphorus pentafluoride, 67 Phthalic acid, 163 Pickering, 183 Pictet, 96, 135 Pinene, 130, 131 Pinner, 135 Piperine, 134, 162 Plattner, 35 Playfair, 20 Pollucite, 35 Pope, 147, 184 Posselt, 135 Praseodymium, 38 Pringsheim, 185 Protamines, 168 Proteins, 165 Prout’s law, an illusion, 76 Ptomaines, 161 Pyridine, 133 Quinine, 137 Quinoline, 133 Racemic acid, 140 Racemism, 143 Radio-thorium, 60