172 



REPORT — 1897. 



of obtaining records from similar instruments, each recording on a surface 

 moving with sufficient rapidity to give an open time scale. It is satis- 

 factory to note that twelve of the disturbances were common to North 

 Germany and the Isle of Wight. 



The following are more exact determinations of the coinmenceynent 

 of disturbances, determined from photograms : — 



No. 4 (Shide 78), Jan. IG 

 „ 6 ( „ 83), Feb. 6 

 „ 11 „ 19 



„ 12 ( „ 88), „ 19 



11. ji. s. G.M.T. 

 10 2 6 

 19 50 30 

 9 4 1 

 12 20 9 



Observations at Mocoa di Papa. Dr. A. Cancani. (These observations reached 

 Shide too late to be used in computations of velocity, &c.) 



VI. The Highest Ajjparent Velocities at which Earth-tuaves are Propagated. 

 By John Milne, F.R.S., F.G.S. 



The following table of the highest apparent velocities with which 

 earthquake motion is propagated over paths of varying length has been 

 drawn up for the purpose of indicating the general character of the 

 information we at present possess bearing upon this subject. 



The sources from which information has been derived are various, the 

 more important being as follows : — 



' Horizontalpendel-Beobachtungen,' by Dr. E. von Rebeur-Paschwitz 

 ('Beitrage zur (3^eophysik,' Band II.). These include observations made at 

 Strassburg, Potsdam, Wilhelmshaven, Nicolaiew, Charkof, by the present 

 writer in Japan, by observers in Italy and other places. ' Bollettino 

 della Societa Sismologica Italiana,' vols. i. and ii. The catalogues, edited 

 by Professor P. Tacchini, contained in the volumes give prominence to the 

 observations made at Italian stations, whilst observations made in Europe 

 and Japan have not been neglected. ' Transactions of the Seismological 



