This follows from my whole thesis as to the assimilation of time and space and their origin in extension.

It also has the same basis in the analysis of the character of our knowledge of nature.

It follows from this admission that it is possible to define point-tracks [_i.e._ the points of timeless spaces] as abstractive elements.

This is a great improvement as restoring the balance between moments and points.
I still hold however to the statement in subarticle 35.4 of the _Principles_ that the intersection of a pair of non-parallel durations does not present itself to us as one event.

This correction does not affect any of the subsequent reasoning in the two books.
I may take this opportunity of pointing out that the 'stationary events' of article 57 of the _Principles_ are merely cogredient events got at from an abstract mathematical point of view.
INDEX _In the case of terms of frequent occurrence, only those occurrences are indexed which are of peculiar importance for the elucidation of meaning._ A [_or_ an], 11 Abraham, 105 Absolute position, 105, 106, 114, 188 Abstraction, 33, 37, 168, 171, 173; extensive, 65, 79, 85 Abstractive element, 84; set, 61, 79 Action at a distance, 159, 190 Action by transmission, 159, 190 Active conditions, 158 Activity, field of, 170, 181 Adjunction, 101 Aggregate, 23 Alexander, Prof., viii Alexandria, 71 Alfred the Great, 137 Anticipation, 69 Anti-prime, 88 Apparent nature, 31, 39 Area, 99; momental, 103; vagrant, 103 Aristotelian logic, 150 Aristotle, 16, 17, 18, 24, 197 Associate-potential, 183 Atom, 17 Attribute, 21, 26, 150 Awareness, 3 Axiom, 36, 121 Axioms of congruence, 128 et seqq.
Bacon, Francis, 78 Behaviouristic, 185 Bergson, 54 Berkeley, 28 Between, 64 Beyond, 186, 198 Bifurcation, vi, 30, 185, 187 Boundary, 100; moment, 63; particle, 100 Broad, C.D., viii Calculation, formula of, 45, 158 Cambridge, 97 Causal nature, 31, 39 Causation, 31, 146 Centrifugal force, 138 Change, uniformity of, 140 Character, extrinsic, 82, 89, 90, 113, 191; intrinsic, 80, 82, 90, 113, 191 Charge, 160 Closure of nature, 4 Coefficient of drag, 133 Coefficients of impetus, 183 Cogredience, 110, 188 Coherence, 29 Comparison, 124, 125, 143, 189 Complex, 13 Conceptual nature, 45; space, 96 Concrete facts, 167, 171, 189 Conditioning events, 152 Conditions, active, 158 Congruence, 65, 96, 118, 120, 127, 196 Continuity, 157; Dedekindian, 102; of events, 76; of nature, 59, 76 Convention, 121 Convergence, 62, 79; law of, 82 Conveyance, 154, 155 Co-present, 177 Covering, 83 Creative advance, 178 Critical velocity, 193, 195 Curvature of space-time, 182 Cyclone, 194 Dedekindian continuity, 102 Definite, 53, 194, 198 Delusions, 31, 38 Delusive perceptual object, 153 Demarcation of events, 144 Demonstrative phrase, 6 Descriptive phrase, 6, 10 Differential equations, 196 Discrimination, 14, 50, 144 Diversification of nature, 15 Duddington, Mrs, 47 Duration, 37, 53, 55, 186 Durations, families of, 59, 73, 190 Dynamical axes, 138 Einstein, vii, 102, 131, 164, 165, 181, 182, 183, 184, 191 Electromagnetic field, 179 Electron, 30, 146, 158, 171 Element, 17; abstractive, 84 Elliptical phraseology, 7 Empty space, 145 Entity, 5, 13 Equal in abstractive force, 83 Error, 68 Ether, 18, 78, 160; material, 78; of events, 78 Euclid, 85, 94, 197 Euler, 140 Event, 15, 52, 75, 165; percipient, 107, 152, 186 Event-particle, 86, 93, 94, 172, 191 Events, conditioning, 152; continuity of, 76; demarcation of, 144; ether of, 78; infinite, 197, 198; limited, 74; passage of, 34; signified, 52; stationary, 198; stream of, 167; structure of, 52, 166 Exclusion, 186 Explanation, 97, 141 Extended nature, 196 Extension, 22, 58, 75, 185 Extensive abstraction, 65, 79, 85 Extrinsic character, 82, 89, 90, 113, 191; properties, 62 Fact, 12, 13 Factors, 12, 13, 15 Facts, concrete, 167, 171 Family of durations, 59, 63, 73; of moments, 63 Faraday, 146 Field, gravitational, 197; of activity, 170, 181; physical, 190 Finite truths, 12 Fitzgerald, 133 Formula of calculation, 45, 158 Foucault, 138, 194 Four-dimensional manifold, 86 Fresnel, 133 Future, the, 72, 177 Galileo, 139 Geometrical order, 194 Geometry, 36; metrical, 129 Gravitation, 179 et seqq.
Gravitational field, 197 Greek philosophy, 16; thought, 197 Gyro-compass, 194 Heath, Sir T.L., 197 Here, 107 Idealists, 70 Immediacy, 52; of perception, 72 Impetus, 181, 182; coefficients of, 183; integral, 183 Inclusion, 186 Individuality, 13 Infinite events, 197, 198 Inge, Dr, 48 Ingredient, 14 Ingression, 144, 145, 148, 152 Inherence, 83 Inside, 106 Instant, 33, 35, 57 Instantaneous plane, 91; present, 72; spaces, 86, 90, 177 Instantaneousness, 56, 57 Intersection, locus of, 90 Intrinsic character, 80, 82, 90, 113, 191; properties, 62 Ionian thinkers, 19 Irrelevance, infinitude of, 12 Irrevocableness, 35, 37 It, 8 Julius Caesar, 36 Junction, 76, 101 Kinetic energy, 105; symmetry, 129 Knowledge, 28, 32 Lagrange, 140 Larmor, 131 Law of convergence, 82 Laws of motion, 137, 139; of nature, 196 Leibnizian monadology, 150 Level, 91, 92 Light, 195; ray of, 188; velocity of, 131 Limit, 57 Limited events, 74 Location, 160, 161 Locke, 27 Locus, 102; of intersection, 90 London, 97 Lorentz, H.A., 131, 133 Lossky, 47 Manifold, four-dimensional, 86; space-time, 173 Material ether, 78; object, 169 Materialism, 43, 70 Matrix, 116 Matter, 16, 17, 19, 20, 26 Maxwell, 131, 133 Measurableness, 196; of nature, 193 Measurement, 96, 120, 174, 196; of time, 65, 140 Measure-system, 196 Memory, 68 Metaphysics, 28, 32 Metrical geometry, 129 Michelson-Morley, 195 Milton, 35 Mind, 27, 28 Minkowski, viii, 131 Molecule, 32, 171 Moment, 57, 60, 88 Momental area, 103; route, 103 Momentum, 105 Motion, 105, 114, 117, 127, 188, 192 Multiplicity, 22 Natural philosophy, 29, 30 Natural science, philosophy of, 46 Nature, 3; apparent, 31, 39; causal, 31, 39; conceptual, 45; continuity of, 59, 76; discrimination of, 144; extended, 196; laws of, 196; passage of, 54; stratification of, 194, 196; system of, 146 Newton, 27, 136, 139, 140 Object, 77, 125, 143, 169, 189; delusive perceptual, 155; material, 169; perceptual, 153; physical, 155, 157; scientific, 158, 169; uniform, 162 Occupation, 22, 34, 36, 100, 101 Order, source of, 192; spatial, 95, 194; temporal, 64, 95, 194 Organisation of thought, 79 Outside, 63, 100 Paradox, 192 Parallel, 63, 127; durations, 190 Parallelism, 95, 191 Parallelogram, 127 Paris, 87, 138 Parliament, 120 Part, 14, 15, 58 Passage of events, 34; of nature, 54 Past, the, 72, 177 Perception, 3 Perceptual objects, 149, 153 Percipience, 28 Percipient event, 107, 152, 186, 187 Period of time, 51 Permanence, 144 Perpendicularity, 117, 127, 193 Philosophy, 1; natural, 29, 30; of natural science, 46; of the sciences, 2 Physical field, 190; object, 155, 156, 157 Physics, speculative, 30 Place, 51 Plane, 191; instantaneous, 91 Plato, 16, 17, 18, 24, 197 Poincare, 121, 122, 123 Point, 35, 89, 91, 114, 173, 176 Point-flash, 172, 173 Point of space, 85 Point, timeless, 192 Point-track, 113, 198 Pompey, 36 Position, 89, 90, 92, 93, 99, 113, 191; absolute, 105, 106, 114, 188 Potential, 183; associate-, 183 Predicate, 18 Predication, 18 Present, the, 69, 72, 177; instantaneous, 72; observational, 186 Primary qualities, 27 Prime, 88 Process, 53, 54; of nature, 54 Psychic additions, 29, 187 Punct, 92, 93, 94 Pythagoreans, 197 Quality, 27 Quantum of time, 162 Quantum theory, 162 Ray of light, 188 Reality, 30; of durations, 55, 187 Recognition, 124, 143, 189 Rect, 91, 92 Recurrence, 35 Relative motion, 117; velocity, 130 Relativity, 169; restricted theory of, 193 Rest, 105, 114, 188, 192 Rotation, 138, 194 Route, 99; momental, 103; straight, 103 Russell, Bertrand, 11, 122, 123 Schelling, 47 Science, 2; metaphysical, 32 Scientific objects, 149, 158, 169 Secondary qualities, 27 Self-congruence, 196 Self-containedness of nature, 4 Sense-awareness, 3, 67 Sense-object, 149, 170 Sense-perception, 3, 14 Sense-recognition, 143, 189 Series, temporal, 66, 70, 85, 178 Set, abstractive, 61, 79 Significance, 51, 186, 187, 188, 194, 197, 198 Signified events, 52 Simplicity, 163, 173 Simultaneity, 53, 56, 196 Situation, 15, 78, 147, 148, 152, 160, 189 Solid, 99, 101, 102; vagrant, 101 Sound, 195 Space, 16, 17, 31, 33, 79; empty, 145; timeless, 86, 106, 114; uniformity of, 194 Spaces, instantaneous, 86, 90 Space-system, 179 Space-time manifold, 173 Spatial-order, 95 Spatio-temporal structure, 173 Speculative demonstration, 6 Speculative physics, 30 Standpoint for perception, 107, 188 Station, 103, 104, 113 Stationary events, 198 Straight line, 91, 114, 191; route, 103 Stratification of nature, 187, 194, 196 Stream of events, 167 Structure of events, 52, 166 Structure, spatio-temporal, 173 Subject, 18 Substance, 16, 18, 19, 150 Substratum, 16, 18, 21 Symmetry, 118, 126; kinetic, 129 System of nature, 146 System, time-, 192 Tarner, Edward, v, 1 Temporal order, 64, 95, 194 Temporal series, 66, 70, 85 Tensor, 182 Terminus, 4 The, 11 Theory, quantum, 162 There, 110, 189 This, 11 Thought, 3, 14 Timaeus, the, 17, 20, 24 Time, 16, 17, 31, 33, 49, 79; measurement of, 140; quantum of, 162; transcendence of, 39 Time-series, 178, also cf.