vi REPORT — 1895. 



Page 

 (e) Object of tbe Catalogues 153 



(d) Results already obtained or shown by the Catalogue and Map 



of Centres 1 55 



IV. On the Velocities with which Waves and Vibrations are propa- 



gated on the surface of and through Rock and Earth. 

 (Compilation) 158 



Introduction 158 



(«) Observations on Artificially Produced Disturbances. Experi- 

 ments of Mallet, Abbot, FoiiQirE and Levy, Geay, and 

 Milne 159 



{b) Observations on Earthquakes. Where the wave paths have 

 been short : (Milne and Omori). Where the wave paths 

 have been long : (Newcombe and Dutton, Agamennone, 

 Ricco, Cancani, von Rebeue-Pascbtwitz, Milne) 163 



(c) The Probable Nature and Velocity of Propagation of Earth- 



quake Motion. The suggestions of Dr. C. G. Knott, Lord 

 Rayleigh, Lord Kelvin 170 



(d) The Paths followed by Earthquake Motion. Hypotheses of 



Hopkins and Sbebach, Schmidt, and a suggestion by the 

 writer 173 



(e) Conclusions 178 



V. Miscellaneous Notes relating to Large Earthquakes, &c 179 



Appendix. — On Causes producing Movements which may be Mistaken 

 for Earth Tremors 182 



Earth Tremors. — Fifth Report of the Committee, consisting of Mr. G. J. 

 Symons, Mr. C. Davison (Secretary), Sir F. J. Bramwell, Professor G. H. 

 Daewin, Professor J. A. Ewing, Dr. Isaac Robeets, Mr. Thomas Gray, 

 Sir John Evans, Professors J. Prestwich, E. Hull, G. A. Lebotjr, R. 

 Meldola, and J. W. JtfDD, Mr. M. Walton Brown, Mr. J. Glaisher, 

 Professor C. G. Knott, Professor J. H. Poynting, Mr. Horace Darwin, 

 and Dr. R. Copeland, appointed for the Investigation of Earth Tremors in 

 this country. (Drawn up by the Secretary) 184 



Appendix. — Note on the History of the Horizontal and Bifilar Pen- 

 dulums. By C. Davison 184 



Metejrological Observations on Ben Nevis. -Report of the Committee, consist- 

 ing of Lord McLaren (Chairman), Professor A. Crtsu Brown (Secretary), 

 Dr. John Mueray, Dr. Alexander Buchan, Hon. Ralph Abeeceomby, 

 and Professor R. Copeland. (Drawn up by Dr. Buchan) 186 



Experiments for Improving the Construction of Practical Standards for Elec- 

 trical Measurements. — Report of the Committee, consisting of Professor 

 Caeey Fostee (Chairman), Lord Kelvin, Lord Rayleigh, Professors 

 Ayrton, J. Peeey, and W. G. Adams, Drs. 0. J. Lodge, John Hopkinson, 

 and A. Muirhead, Messrs. W. H. Preece and Herbert Taylor, Professor 

 J. D. Everett, Professor A. Schuster, Dr. J. A. Fleming, Professors 

 G. F. FitzGerald, G. Chrystal, and J. J. Thomson, Messrs. R. T. Glaze- 

 brook (Secretary) and W. N. Shaw, Rev. T. 0. Fitzpateick, Dr. J. T. Bot- 

 tomley. Professor J. Vieiamu Jones, Dr. G. Johnstone Stoney, Professor 

 S. P. Thompson, Mr. G. Forbes, Mr. J. Rennie, and Mr. E. H. Geipfiths 195 



Appendix.— On Magnetic Units. By Dr. 0. J. Lodge 197 



Remarks on the above. By Professor Everett 207 



Remarks on the above. By Professor G. Carey Foster 

 and Dr. G. Johnstone Stoney 208 



