Darwin, Charles, on the movement of coast lines, 160 — George H., on earth tides, 285 — on tidal loads, 291 — on earth pulsation, 330 — on the effect of fluctuations of barometric pressure, 336 — experiments at Cambridge, 310 Delauney, M. J., on the influence of the planets on earthquakes, 261 Diagonic, definition of, 11 Diastrophic, definition of, 11 Direction of motion, from instrumental records, 198 Distribution, on earthquake, 226 — examples of, 231 Disturbance, on the propagation of, 50 Douglas, J., on South American houses, 126 Earth particle, on the velocity and acceleration of, 79 Earthquake motion, nature of, as deduced from the feelings, 67 — direction of, derived from instrumental records, 69 — duration of, 71 — period of vibration in, 74 — examples of extent of, 75–77 — absolute intensity of force in, 83 — radiation of, 85 — velocity of propagation of, 87 Earthquake at Lisbon, velocity of propagation of, 88 Earthquakes, general examples of effects of, 142 — geological changes produced by, 161 — hunting, 187 — distribution of, 226 — maps, 189 — secondary, 248 — table of, for nineteenth century, 259 — on the course of, 277–281 — and tides, 290 — prediction of, 297–304 Elastic waves, nature of, 44 Emergence, angle of, 9 Energy, dissipation of, in earthquakes, 52 — seismic, in relation to geological time, 234 — — table of, 240 Epicentrum, definition of, 9 Euthutropic, definition of, 11 Ewing, J. A., pendulum seismograph of, 25 — astatic pendulum of, 26 — bracket seismograph of, 26 Falb, R., on the influence of the sun and moon on earthquakes, 286 Fissures, on the material discharged from, 148 — on the explanation of, 151 Focal cavity, definition of, 9 — on the form of, 221 Forbes, D., on an earthquake in Mendoza, 151 Frequency of earthquakes, 243 Frere, Sir H. Bartle, on geological changes produced by earthquakes, 161 Fuchs, on sea waves, 176 — on the movement of the seismic centre, 233 — on earthquakes and volcanic outbursts, 271 — on hot springs, 157 Fumaroles, the effect of earthquakes on, 156 Geinitz, Dr., on sea waves, 182 Geologists, on the interest of seismology to, 2 Gray, T., astatic pendulum of, 26 — bracket seismometer of, 27 — conical pendulum of, 29 — dead heat pendulum of, 22 — on the rotation of bodies, 196 — rolling spheres and cylinders of, 29 — torsion pendulum seismometer of, 25 — vertical motion seismometers of, 32, 33 — and Milne, seismograph of, 38