INDEX. 



ABB 



Abbadie, M. d', OD earth tremors, 

 309 



Abbot, General H. L., on the trans- 

 mission 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, experi- 

 ments 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 earth- 

 quakes, 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 civilisa- 

 tion, 1 



Builders, interest of the study of 

 earthquakes to, 3 



CENT 



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. Augustine 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 fre- 

 quency, 245 



■ — onbarometric height and earth- 

 quakes, 266 



Carruthers, J., on earthquakes 

 and tides, 291 



Centrum, definition of, 9 



— on the depth of, 213 



— on the maximum depth of 218 



