168 



KEPORT — 1895. 



Dr. Agamennone, after examining the data on which these tables are 

 founded, shows that the conclusion to which they point disappears if the 

 time taken at Cadiz by the stopping of two clocks was a minute too late, 

 while the times at Greenwich and other observatories correspond to the 

 beginning of the motion. From the calculations of Offret relating to the 

 Ligurian earthquake of February 23, 1887, it would appear that the 

 velocity of propagation increased as a disturbance radiated, but such 

 anomalies may also be explained by the assumption that there were errors 

 in the time observations near to the epicentre. 



As another indication of what is apparently the reverse of the results 

 adduced by Dr. Cancani, we may take either the earthquakes of Zante or 

 the following Japanese earthquakes, observed in Europe by Dr. E. von 

 Rebeur-Paschwitz : — 



The centre of the second disturbance is taken near to Kumamoto, 

 while that of the others as being near to Tokio. 



Arranging the above according to distance, we find : — 

 (5 observations for 7.910 km. give a velocity of 2-73 



S,900 

 9,520 



3- It; 

 3-41 



The numeral I. refers to the greatest increase in motion, while II. 

 refers to the maximum itself, and it will be observed that the value for 

 JI. is always less than it is for I. 



A good series, showing the -wddely different results which may be 

 obtained as to the velocities with which given disturbances are propagated, 

 may be found in the British Association Report of the Committee on 

 Earth Tremors for 1894. The earthquakes to which these refer are those 

 of April 20 and 24 of 1894, which originated in North-east Greece, and 

 which were recorded by different types of instruments at 41 different 

 stations in Europe, the length of the wave paths being from 701 to 

 2,4.55 km. The velocities obtained vary between 1-29 and 11-71 km. per 

 second. The high velocities are those obtained from records of the com- 



