158 



F. OMORI. 



TABLE IV-DAILY NUMBERS OP EARTHQUAKES AND BAROMETRIC 



HEIGHTS AT GIFU, FROM OCTOBER 28th, 1891, 



TO APRIL 30th, 1892. 



I. The " Mean Bai-ometric Height " was olitained by taking the mean of six observations 

 on each clay, at 2, 0, 10, a.m., and 2, G, 10, p.m. The " Fluctuation " is the difterence Ijetween 

 these observations, + when rising, and - when falling. For instance, - 3.5, + .3.7 means 

 that the pressure first fell by 3.,5 mm. and then rose by 3.7 mm. 



