ox THE AFTEK-SHOCKS OF EARTHQUAKES. 



195 



TABLE XVII. -MONTHLY AND YEARLY NUMBER OE EARTHQUAKES 



INSTRUMENT ALL Y RECORDED IN TOKIO FROM JANUARY, 



1876, TO DECEMBER, 1893. 



Xote. — The greatest monthly earthquake number, namely 15, oecurrod in October, 1801. Of 

 this however, 2S took place within the last four days of the month, being- due to the residual 

 effect of the great Mino-Owari Earthquake. We may take (15 — 28) Xl^'^lO as the proper 

 nimber of shocks for October, 18'JL. Making this modifie ition, the total number for 1S91 

 becomes 97, and the average monthh' number for October becomes (3. These latter values 

 have been used in drawing curves, Figs. IS, (4) and 20. 



