Dimension. Definition of, 3 Direct Voice, 62 Disembodiment, cases of, 58, 150-154 Dreams, 54, 55 Electricity. Hinton's theories of, 127 Etheric double, 35, 62, 147-148 Energy, conservation of, 117, 120 Ether. Hinton's analogy, 127 Exteriorisation of Sensibility, 141 Faith and Reason, 169 Fatalism, 107-109 Flatland, 7 Geometry. Possible break down of, 124, 126 Hair-trigger theory, 116, 141 Hallucination, 50, 51 Hypothesis. Need of, 24-38 Valid, 29 True, 29 Hyslop, Dr., 77 Internal Vision, 46-49 Kilner, Dr., 142-143 Levitation, 86, 91, 145 Light. Theories, of 29, 30 Materialists, 32, 176, 177 Milan Committee, 83 Occultists 32, 34 One-dimensional space, 7 Palladino, Eusapia, 74, 83 Parallaxes, Negative, 126 Peters, Dr., 83 Phantasms, 52, 55, 57 Pogorelsky, 84 Poincaré, 124 Postvision, 42, 52 Prevision, 39, 42, 52, 103-107 Psycho-analysis, 55 Reason and Faith, 169 Reichenbach, 140 Relativity, 133-135 Religion, 32, 168-180 Richet, 31 Rotation in four space, 129 Sambor, 84 Secondary personality, 41 Sensibility. Exteriorisation of, 141 Slade, 64, 73 sqq. Space. Objectivity of, 109-112 Spectrum, 43 Symmetry, 131-133 Telekinesis, 39, 86 Telepathy, 39, 41 Television, 46, 48, 111 Tesseract, 188, 189, 191 Theologians, 32 Theosophists, 35, 159, 160 Time, 92-103 Measurement of, 94 Bergson's views on, 96, 98 Subjective, 99 Two-dimensional world, analogy of, 7 sqq. Ultra-violet light, 43, 144, 160 Vitality, 113-141 Vortices. Four-dimensional, 127 Will, 113-141 Zero-dimensional space, 7 Zöllner, 1, 62, 73 sqq.