Primary law, 66, 75, 98; insufficiency of, 107 Primary scheme of physics, 76, 129, 295 Principal curvature, 120, 139 Principia, 4 Principle of Correspondence, 196 Principle of detailed balancing, 80 Principle of indeterminacy, 220, 306 Probability, 216, 315 Proof and plausibility, 337 Proper-distance, 25 Proper-time, 37 Proportion, sense of, 341 Proton, 3 Psi (), 216, 305 Pure mathematician, 161, 337, 347 Purpose, 105 -numbers, 208, 270 Quantum, 184; size of, 200 Quantum laws, 193 Quantum numbers, 191, 205 Quest of the absolute, 26, 122; of science, 110, 287; of reality, 328 Quotations from Boswell, 326 Brooke, Rupert, 317 Clifford, W. K., 278 Dickens, 32 Einstein, A., 294 Hegel, 147 Huxley, T. H., 173 Kronecker, L., 246 Lamb, H., 316 Lewis Carroll, 28, 291, 344 Milton, 167 Newton, 111 Nursery Rhymes, 64, 70, 262 Omar Khayyam, 64, 293 O’Shaughnessy, A., 325 Russell, Bertrand, 160, 278 [Pg 360] Quotations from (cont.) Shakespeare, 21, 39, 83, 292, 330 Swift, 341 Whitehead, A. N., 145 Radiation pressure, 58 Random element, 64; measurement of, 74 Reality, meaning of, 282, 326 Really true, 34 Rectification of curves, 125 Rejuvenescence, theories of, 85, 169 Relata and relations, 230 Relativity of velocity, 10, 54, 59, 61; of space-frames, 21; of magnetic field, 22; of distance, 25; of pound sterling, 26; of Now (simultaneity), 46, 61; of acceleration, 129; of standard of length, 143 Religion, 194, 281, 288, 322, 324, 326, 333, 349 Retrospective symbols, 307, 308 Revolutions of scientific thought, 4, 352 Right frames of space, 18, 20 Roemer, O., 43 Rotating masses, break-up of, 176 Running down of universe, 63, 84 Russell, B., 160, 277, 278 Rutherford, E., 2, 327 Scale (measuring), 12, 18, 24, 134, 141 Schrödinger’s theory, 199, 210, 225, 305 Scientific and familiar worlds, xiii, 247, 324 Second law of thermodynamics, 74, 86 Secondary law, 75, 79, 98 Seen-now lines, 44, 47 Selection by mind, 239, 243, 264, 330 Self-comparison of space, 145 Sense-organs, 51, 96, 266, 329 Shadows, world of, xiv, 109 Shuffling, 63, 92, 184 Sidereal universe, 163 Signals, speed of, 57 Significances, 108, 329 Simultaneity, 49, 61 Singularities, 127 Sirius, Companion of, 203 de Sitter, W., 167 Slithy toves, 291 Solar system, origin of, 176 Solar system type of atom, 2, 190 Sorting, 93 Space, 14, 16, 51, 81, 137 Spasmodic moon, 226 Spatial relations, 50 Spectral lines, 205, 216; displacement of, 121, 166 Spherical curvature, radius of, 140 Spherical space, 82, 166, 289; radius of, 167 Spiral nebulae, 165 Spiritual world, 281, 288, 324, 349 Standard metre, 141 Stars, number of, 163; double, 175; evolution of, 176; white dwarfs, 203 States, 197, 301