10 Art. 6.— T. Terada : 



treated in a similar manner. The diagram obtained seems to be- 

 long -to Class I. Tliis shows probably that the Class I predomi- 

 nates in the entire seismic zones of the world. This point deserves 

 a more detailed study with respect to sufficient materials. 



II. Pressure and Temperature. 



In the preceding chapter, I have shown that the yearly 

 frequencies of earthquakes in Japan and Jamaica are closel}^ 

 associated with the absolute value of the difïerence of the spots or 

 faculae area on the northern and southern solar hemispheres in 

 the corresponding year, which we may call the 'hemispherical 

 difference' and denote by |.V— aS'I, or more properly with the quantity 

 |xV— xS'|/(iV+*S') which we may denote by «5 and call the 'specific 

 hemispherical difference'. For the discussion of the results, it be- 

 came necessary to investigate the similar relation witii respect to 

 the yearly mean pressure and temperature in different parts of the 

 world. For this purpose, the most convenient materials near at 

 hand was afforded by Walker's fifth and sixth memoirs on the 

 'Correlation in Seasonal Variations of Weather', frequently cited 

 in my previous papers. The data given there were adopted with- 

 out any reduction. Since the solar data available^^ were limited to 

 the epoch 1886-1916, the terrestrial data before 1886 could not be 

 utilized. Besides, the weather data do not extend beyond 191S 

 so that the epoch here treated refers at most to 1886-1912.^-' For 

 a number of stations the data are missing still further. Notwith- 

 standing the want of homogeneity, the whole data were subjected 

 o the similar treatment, as it seemed most practical for the pre- 

 sent preliminary investigation. Besides, the pressure and tem- 

 perature data of Apia, Samoa, recently published by Angenheister^^ 

 were untilized, since they are valuable in filling up the want of 

 stations in the Pacific region. 



n E. W. Maunder : Note on the Distribution of Solar Faculae, Monthly Notices of the 

 Eoyal Astronomical Society, 80 (1920), p. 728. 



2) For Nagasaki and Tokyo, the pressure and temperature data were available up to 1916. 



3) From the abstract given in Meteor. ZS., 1922. 



