( 272 ) 



The day-waves however are smaller and shorter, the night-waves 

 larger and longer and also more regular in shape. These regular 

 night-waves are often restricted to one large wave, very suitable 

 for the study of these waves. 



Hourly distribution of the end of the storm. 



Quite in agreement with the above mentioned conclusions, the 

 curve representing the diurnal periodicity of the final-hour is nearly 

 the reverse of that for the maximum. 



Evidently the hour (the end of the day) has been strongly 

 favoured. 



Resuming we may according to the Batavia disturbance-record 

 draw the following conclusions : 



1^*. the origin of S-storms is cosmical ; 



2"*^. the origin of (ji-storms may he also cosmical, hut the com- 

 mencement is dependent on the local hour; 



3^'^. the development of all storms, concerning the agitation, is hi 

 the same way depeiident on the local hour. 



Storms and sunspots. 



lu the following table the year has been reckoned from April 1^ 

 till April l«t of the following year, with the exception of 1882, the 

 diagrams for the months Dec. '82, Jan. — March '83 missing. For 

 1880 — '83 the yearly numbers have been increased in proportion 

 to the number of missing record days. 



