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