Parmenides, monistic view complete in, 251 Parry, Professor R. B., 292 Perception, difference between introspection and, 10 f. a species of sensitivity, 59, 123 and inference, 65 f. from objective standpoint, 66 ff. of external event, analysis of, 123 ff. element of subjectivity in, 130 ff. and causal laws of physics, 145 ff. its relation to the object causal and mathematical, 149 from introspective standpoint, 201 ff. Perceptive knowledge, stages in act of, 18 ff. Percepts, 133, 135, 137 ff. Perspective, 152 Philosophy, the business of, 2, 236 Behaviourism as a, 129 ff. Utilitarian, 229 f. systems of Descartes, Spinoza, and Leibniz, 237 ff. Locke, Berkeley, and Hume, 244 ff. conscious purpose of, 299 Physics, modern, 97 causal laws in, 114 ff., 145 ff. and perception, 123 ff. spatial relations in, 137 ff. our knowledge of, 151 ff. only mathematical properties of, discoverable, 157 less deterministic than formerly, 239 and psychology, 282, 289 Pictures, as representations, 183 “Planck’s Constant”, 101 f. Plato, 226 Poetry, 220 Probability, fundamental in science, 274 _a priori_ on Mr. Keynes’s theory, 274 “frequency”, theory of, 274 f. Psychology, 16, 172, 184 and physics, 282, 289 “Psychophysical parallelism”, 238 “Public good”, the, 230 Publicity, in the case of physical phenomena, 170 Quantum changes, 106 Radio-activity, 99, 103 Reactions, learned, 21, 33, 35, 36, 49, 81 Realism, naive, 175 Recognition, two forms of, 196 Recollection, true, 197 ff. Relations, Bradley’s argument against, 252 cause of confusion about, 264 Relativity, theory of, “space-time” instead of one cosmic time and space, 108 some results of the, 108 ff. “events” instead of bodies moving, 110 relations between “events”, 110 f. no “forces” in the, 111 philosophical consequences of the, 293 “Right conduct”, 230 Rutherford, Sir E., 99, 101 Santayana, Mr., 230 Schiller, Dr. F. C. S., 79 Schrödinger, 98, 105, 278, 293, 294 Self-observation, 126, 161 ff. basis of Descartes’s system, 162 ff. Dr. Watson’s views, 167 ff. gives knowledge not part of physics, 175 Semon, 49, 180 Sensation, difference between images and, 179 acoleuthic, 197 as opposed to perception, 204 Sensitivity, 59 f., 88, 123, 177 Sentences, 51, 54, 75, 255, 264 Sequence, laws of, 116 Shakespeare, 192 Sheffer, Dr. H. M., 282, 292 Sight, compared with touch, 156 f. Size, sense of, 153 Socrates, 226 “Solipsism”, 291 Sommerfeld, 103 Space, one persistent, abolished in relativity theory, 108 physical and perceptual, 137 ff., 241 f., 294 Space-time, in theory of relativity, 108 ff. structure of, 145 point-instant in, 278 “Specious present”, 195, 197 Spinoza, 238, 251 _Stars and Atoms_ (Eddington), 279