78 



REPOM— 1900. 



Mexico (250, 381). 

 Assuming 21, 22 mins. as times from origins to Victoria 



Ceram (.347). 

 Time calculated as in Alaskan earthquake. 



chord 1 arc radians „ , j j j. kilom. , i.- i • i i ao 



— , — and , may be reduced to by multiplying by rOb 



min. mm. sec. 



arc degrees 



1-84 



mm. 



It will be noted that there are certain slight differences between the 

 figures used in this last table and those in the table on p. 81. These, 

 however, do not produce any appreciable effect upon the general character 

 of the investigations which have been made. 



13. The Origin of Large Earthquakes xohich were recorded in the 

 Isle of Wight in the Year 1899, 



In 1899, at Shide, in the Isle of Wight, 130 earthquakes were recorded. 

 One hundred and five of these were also recorded at one or more of the 

 following places: Kew, Toronto, Victoria (B.C.), San Fernando, Bombay, 

 Madras, Calcutta, Mauritius, Batavia, Cape of Good Hope, Tokio, Cairo, 

 and Mexico. There is no doubt that many of these were also recorded 

 at other observatories, but from these registers have not yet been 

 received. 



The localities at which a certain number of these earthquakes originated 

 have been determine^d with a fair amount of accuracy. Other determina- 

 tions are somewhat indefinite, whilst a large residuum of comparatively 

 small disturbances have been grouped as having originated somewhere in 

 the vicinity of the one or two stations at which they were recorded. 



The results exhibited in map (Plate III.) are therefore of varying values, 

 and although they give a general idea as to the distribution of seismic 

 activity for 1899, they are chiefly of interest as. illustrating the character 

 of the more definite information which we may expect to derive from 

 the extension of the present system of observation. 



