30 REPORTS ON THE STATE OF SCIENCE. 



Seismohgical Investigations. — Sixteenth Report of the Committee, con- 

 sisting of Professor H. H. Turner (Chairman), Mr. J. Milne 

 (Secretary), Mr.C. Vernon Boys, Sir George Darwin, Mr. Horace 

 Darwin, Major L. Darwin, Dr. E. T. Glazebrook, Mr. M. H. 

 Gray, Mr. R. K. Gray, Professor J. W. Judd, Professor C. G. 

 Knott, Professor R. Meldola, Mr. R. D. Oldham, Professor 

 J. Perry, Mr. W. E. Plummer, Mr. Clement Reid, Professor 

 R. A. Sampson, and Professor A. Schuster. (Drawn up by 

 the Secretary.) 



[Plates I. and II.] 



Contents. page 



I. General Notes (Registers, Visitors, Exhibition, New Stations, Colonial Office) 30 



II. Double and Multiple Earthquakes 32 



III. Seismic Activity in Japan, Italy, and America, 1700-190(1 .... 36 



IV. Synchronism of Seismic Activity in different Districts 36 



V. Megaseismic Frequency 38 



VI. Tidal-Load Observations at Ryde 39 



VII. Tidal-Load Experiments in Pennsylvanian Railway Tunnels . . . 40 



VIII. Experiments in Pits in the Midlands 40 



IX. List of Strong Shocks in the United States 41 



X. Destructive Earthquakes in Peru and North Chile 45 



XI. Unpublished Notes relating to Destructive Earthquakes 47 



XII. Seismic Activity 1899-1903 inclusive 55 



XIII. Sensibility of Seismographs recording on Smoked Surfaces .... 66 



I. General Notes. 

 The Committee seek to be reappointed with a grant of 607. 



Registers. — During the last year Circulars Nos. 22 and 23 have 

 been issued. They refer to Shide, Kew, Bidston, Edinburgh, Paisley, 

 Eskdalemuir, Guildford, Stonyhurst, West Bromwich, Haslemere, 

 San Fernando, Ponta Delgada, Toronto, Victoria, B.C., Beirut, Cairo, 

 Valletta, Cape of Good Hope, Bombay, Kodaikanal, Colombo, Hono- 

 lulu, Perth, Sydney, Wellington, Christchurch, Baltimore, Mauritius, 

 Cape Verde, Ascension, Calcutta, and Adelaide. 



Visitors. — During the last year many people visited the observatory 

 at Shide. Among those who came for instruction or to obtain special 

 information were the following: Prince B. Galitzin; G. Baymond, 

 H.M. Consul at Corfu ; Professor B. Mano, of the Earthquake Investi- 

 gation Committee of Japan; Professor H. H. Turner; J. Woodrow, 

 Coats Observatory; P. J. Hood, Eastern Telegraph Company; M. H. 

 Gray; T. Chance, Cardiff; Professor J. Swain, Cork University; G. H. 

 Harrison, in connection with Tidal Load instrument at Ryde; Colonel 

 G. Elliott, B.E.; W. E. Jenkin, Bio Tinto Mines, Spain; Sir Daniel 

 Morris, who has given assistance in establishing an instrument in the 

 West Indies; W. G. Freeman, Trinidad; F. H. Longhurst, Deputy 

 Director of Public Work, Accra ; Members of the Science Section of 

 the Bournemouth Natural History Society; B. F. E. Keeling, Cairo. 



Seismological Exhibition. — At the suggestion of the Science Com- 

 mittee of the Coronation Exhibition at the White City, I organised a 

 Seismological Section. This Committee communicated with most of 



