231 — 



The vertical intensities read at Ssagasti/r from an unifilar 

 with ironbars show such abnormal changes, that they evidently 

 are less thiustworthy, and accordingly they have not been 

 used. 



For Greemvich the hourly means of selected quiet days are 

 published each year. Mean vahies for the components have 

 been computed for the months of June and July of the 10 years 

 1890—1899. 



For Ti ff is the days riualifled as normal or quiet for the 

 three elements (H, D and Z) at Paidoirk have been used. 



The months of June and July of the years 1880 — 1884, 

 1886, 1887 have been used for the horizontal component, 

 but for the vertical component August has been added. 



For Washington tlie same quiet days as those of Petersburg 

 for the months of June and July of the years 1889 — 1892, 

 1894 have been used too (taking into account the difference 

 in time). 



For Batavia the author had an opportunity to select the 

 quiet days from the original photograms; also for Zi Ka Wei 

 these dates have been taken into account. 



They are: 



Jnnc. Jnly. 



1890. 13, 14, 25. 3, 16, 27, 28. 



1801. 10, 11, 13. 8, O, 11, 13. 



1892. 11, 12, 18. 7, 8. 



