ON seismological investigation. 



165 



Tremors Observed before the Shock 011 December 16, at about 177*. 32m. 1896. 



Tremors Observed after the Shock on December 16, at Vih. 32 w. 1896. 



At the time the tremors were recorded Seismograph T was mo-\'ing 

 under the influence of convection or other air currents. From time to 

 time, however, it showed maxima of rapid motion, which indicates the 

 existence of an influence superimposed upon the slow swing. The times 

 of the commencement of these maxima are therefore not closely defined. 

 Notwithstanding this want of definition, it is worthy of note that eleven 

 of these records closely agree with the commencement of ten groups of 

 tremor records obtained from Seismograph W in another room, and the 

 times at which persons in various parts of England believed that they 

 had been disturbed by slight earthquakes, or had seen evidences of earth 

 movement. 



During the night there were altogether thirteen tremors at which the 

 seismographs moved sinjultaneously ; but it must be noted that there were 



