72 



REPORT — 1900. 



of shocks and their first echoes, together with their respective amplitudea 

 expressed in millimetres. These records are from similar instruments. 



381 Mexico. At Victoria and Toronto the chief motion is followed by 



three reinforcements at intervals of 3 minutes. At Kew 

 there are two at intervals of about 3 minutes. 



The second group of waves, giving the large interval for the Cape of 

 Good Hope in 333 and 338, may possibly refer to the motion which reached 

 that station by the longest path round the earth. 



If so regarded, these entries do not refer to echoes, but to repetitions. 

 The large entries for Victoria and Toronto on account of the comparative 

 nearness of these places to the origins of earthquakes 333, 337, and 338, 



