Alexander, Prof. T. The Development of the Record given by a Bracket Machine. Milne, J. Earth Pulsations. Ewing, J. A. Note on a Duplex Pendulum with a Single Bob. Gergens, F. Note on an Iron Casting, Supposed to have been Disturbed whilst Cooling by an Earthquake. West, C. D. On a Parallel Motion Seismograph. Ewing, J. A. Certain Methods of Astatic Suspension. Alexander, T. Ball and Cup Seismometer. Knipping, Messrs. Paul and. Report on a System for Earthquake Observation. Catalogues of Earthquakes. INDEX. Abbadie, M. d’, on earth tremors, 309 Abbot, General H. L., on the transmission of vibrations, 62 Abella, M., on the earthquake in the Philippines in 1881, 77 Activity, on seismic, 6 Aristotle, on the classification of earthquakes, 41 Artificial earthquakes, experiments on, 57 — — intensity of, 61 Aurora, on the occurrence of, with earthquakes, 264 Ayrton and Perry, on the effect of soft foundations, 130 — — on the period of vibration of buildings, 115 — — on the principle of, 31 Barometer, effect of changes of, on earthquakes, 266 Bertelli, on aurora and earthquakes, 265 — on earth tremors, 316, 320 — on the normal tromometer of, 317 Bittner, A., on the buildings of Belluno, 100 Bridges, on earthquake, 140 Brunton, R. H., on buildings in earthquake countries, 123 Buckle, on the history of civilisation, 1 Builders, interest of the study of earthquakes to, 3 Buildings, on cracks in, 98, 108 — the effect of earthquakes on, 96 — on the irregular destruction of, 96 — — effect on the end house in a row, 112 — — church of St. Augustin at Manilla, 113 — — relation of destruction of, to earthquake motion, 103 — — protection of, 143 — — pitch of the roof of, 110 — — position of openings in the walls of, 111 — — swing of, 115 — — period of vibration of, 115 — — principle of relative periods in, 116 — — types of, for earthquake countries, 121 — — effect of underlying rocks on, 130 — general conclusions regarding, 144 Cacciatore, definition of the, 18 Caldcleugh, A., on earthquake frequency, 245 — on barometric height and earthquakes, 266 Carruthers, J., on earthquakes and tides, 291 Centrum, definition of, 9 — on the depth of, 213 — on the maximum depth of, 218 Centrum, determination of position of, _see_ origins Chaplin, W. S., on the bracket seismometer of, 27 — on earthquakes and the position of the moon, 252 Coast line, on the movement of, 160 Cocks, R., on earthquakes and tides, 290 Coseismic lines, definition of, 10 Curves, on microseismic, 321