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shows that the agilation of G-storms is greater during a sunspot 

 maximum, than in minimum-jears. Also in maximum-years the S- 

 storms of intensity 1, are hidden by their stronger brothers to such 

 an extent, that the eleven-yearly periodicity is nearly the reverse 

 for them. 



Annual distribution of S- and G-storms. 



(Only the uninterrupted period April 1, 1883— April 1, 1899 



has been considered). 



A strong difference in behaviour between G- and S-storms can be 

 noticed. The G-storms have no annual periodicity as to their frequency, 

 whereas the S-storms show a strong one. 



This points, just like the daily periodicity of commencement, either 

 to a different origin, or to a changing tendency of the development 

 of the S-impulse during the day and year. 



Comparison ivith Greenwich-storms. 



Maunder derives from the reproduction of storms published in the 

 volumes of the Greenwich Observations a maximum at 6'' p. m. and 



