Darwin, 12 Darwin, G. H., in Admiralty Manual, 34 Darwin, G. H., on tidal evolution, 97, 118, 122, 151, 185 Day and month equal, 107 Day at present increasing, 68 Day of 1400 hours, 121 Day of 3 or 4 hours, 75 Decline of earth's heat, 90 Diagram showing why moon recedes, 70 Diego Garcia, Krakatoa heard at, 83 Difficulties of tidal evolution, 48 Dives and Lazarus, 161 Dust clouds, 84 Dynamical principle, 65 Dynamical stability, 110 Earth and moon as rigid body, 107 Earth a fly-wheel, 57 Earth, fusion of, 12 Earth, heat of, 80 Earth in highly heated early state, 92 Earth's crust, Lyell on, 12 Earth's history, 12 Earth-moon system originally, 107 Earthquakes, 80 Eccentricity of moon's path explained, 184 Ecliptic, obliquity of, explained, 184 Economic aspects of tides, 45 Egg on end, 108 Elliptic orbit of moon, 113 Endowment of moment of momentum, 167 Energy for tides, whence, 67 Energy lost by tides, 60 Energy of moon's position, 50 Energy of motion, 51 Energy of separation, 50 Energy, sources of, 49 Equality of day and month, 122 Equilibrium, stable and unstable, 108 Equinoxes, precession of, 72 Eruption of volcanoes, 80 Establishment, 30 Estuary, tides in, 152 Explosion of Krakatoa, 83 Extinct season, moon, 129 Fiji, 24 Fishes, periods of fossil, 12 Fitzgerald, Prof., on Hertz' experiments, 101 Floating log, 109 Fortnightly tide, 34 Friction brake, 69 Friction, tidal, 40, 47 Full and change, tides during, 22 Fundy, Bay of, tides in, 39 Gauge for tides, 31 Geological chronology, 146 Geology and tides, 144 Geometric series, 92 Geysers, 85 Gibraltar, Straits of, tides in, 38 Glimpse through the corridors of time, 148 Glorious sunsets from Krakatoa, 85 Greatest length of day, 121 Greatest length of month, 122 Greatest tides, 39 Green moons from Krakatoa dust, 84 Greenock, tides at, 22 Grindstone, rupture of, 76 Gunpowder, energy from, 51 Hall, Prof. A., discovers satellites of Mars, 142 Harmonic analyzer, 35 Heated body, cooling of, 79 Height of tide, how to measure, 29 Helmholtz explains the constant face of the moon, 136 Hertz, undulations of ether, 101 High water, is it under the moon? 21 High water, simple rules for, 26 High water twice a day, 18 Hot springs, 85 Hot waters of Bath, 89 Hour of high water, how found, 26 Howth, 25 Hull, tides at, 23 Ichthyosaurus, 148 Impulse, effect of timed, 101 Incandescence of earth's interior, 85 Incandescence of moon, 94 Indian ocean, 84 Initial condition of earth and moon, 76 Instability, dynamical, 110 Interval, luni-tidal, 30 Iron, machine for punching, 55 Iron smelting, 87 Java, 82 Jupiter, 141, 156 Kepler's Law, 53, 114 Kerguelen Island, 24 Kingstown, 21 Krakatoa, 58 Lagrange, 186 Language, origin of, 12 Laplace, 186 Laurentian rocks, 148 Law of tides, 15 Lazarus and Dives, 161 Leakage of heat, 86 Length of day increasing, 68 Leverrier discovers Neptune, 186 London, tides at, 23, 27 Lunar and solar tides compared, 15 Lunar diurnal tide, 34 Luni-tidal interval, 30 Lyell, 12