ON THE YOLCANIC PHENOMENA OF JAPAN. 



431 



Earthquakes between 1878 axd ISSG—contmued. 



The ratio of the number of earthquakes which have occurred when 

 the barometer has been below the average pressure, to the number when 

 the barometer has been above the average pressure, is as 56 : 44. 



The number of earthquakes which have occurred in each month when 

 the atmospheric pressure has been above the average, and the number 

 which have occurred when it has been below the average, are given in 

 the following table : — 



The next table gives the number of earthquakes which have occurred 

 when the barometer has been rising, when it has been falling, and when 

 it was steady : — 



Earthquakes therefore appear to be m ost frequent when the barometer 

 has been steady, less when it has been rising, and least when it has been 

 falling. 



(e) EarthquaJces and Temperature. — The following table gives the 

 number of earthquakes felt between 1877 and 1886, when the thermo- 

 meter has shown different temperatures : — 



