406 



F. OMORI : 



only tlie eartliquake numbers for tlie months between January, 

 188Ö, and October,' 181*1, have been utilised hi deducing the 

 mean montlily earthquake frequencies given at the bottom of 

 the Table, ^Yhicll are intended to represent the approximate state of 

 seismic activity in ordinary times, namely, in those years free from 

 destructive earthquakes and their after-shocks, the numbers for the 

 six months, from July to December, 188*>, having also been left 

 out of account, in order to exclude the greater j^ortiou of the after- 

 shocks of the Kumamoto earthquake of the 28th July, 1889. 



In Tables Yll and VIII are given respectively the seasonal 

 and the semi-annual distribution of ordiiiarij or non-destructive 

 earthquakes deduced from Table A"I. 



TABLE VI. 



1) The earthquake numher for Octuber 1891 »loes not inohule tlie after shocks oi the 

 Mino-Owari Earthquake of tlie 28th of the same month. 



2) Foinaosa anil Liu-kiu Islands exccjited. 



