82 



Baltimore and the British stations, it may be remarked, are about equidistant from the antipodes of the 

 supposed origin. (See No. 117.) It may be noted that this disturbance was not recorded at Hamburg, 

 Strassburg, or Russian stations, at all of which there are instruments of much greater sensibility than the 

 Milne type. 



121. Octobers. 



Origin about 15 distant from the " Discovery," probably in the direction of Cordova. 



122. October 14. 



By the method of circles, with Manila as zero, an origin is indicated in or near the Carolines, 130 E. 

 Long, and 10 N. Lat. The determination is, however, vague. 



It may be noted that the disturbance does not appear to have passed beneath the Pacific Ocean to 

 stations in North America, whilst it has been transmitted to a great distance across the continents of Asia 

 and Europe. Whether this indicates an oceanic damping effect, or results from the direction of the initial 

 impulse, is open to conjecture. (See map.) 



123. Ofiuber 14. 



The two values for C suggest an origin somewhat nearer to San Fernando than to the " Discovery." 

 The interval M - C for San Fernando indicates an origin some 60 distant from that station. An origin 

 may, therefore, be sought in the western part of the Southern Atlantic in about 35 W. Long, and 20 S. 

 Lat. This shock could not have been recorded at Cordova, because at the time of its occurrence a tremor 

 storm was in progress at that station. It is not likely to have disturbed the instruments in Cape Town, 

 as shocks spreading in this direction have not so far made themselves sensible at that place (see Nos. 72, 

 94, and 116, &c.). 



The suggested origin, although it does not accord with the value M - C for the " Discovery," is quite in 

 accordance with the amplitude and duration noted at that station. 



