20 DISCUSS] N <) F T 11 E HORIZO N T A I. CO M P N E N T 



The larger disturbances having been excluded, new monthly means were taken, 

 and the process was repeated several times, when required, until all readings differ- 

 ing 33 scale divisions or more had been excluded; the final means constitute the 

 normals as given in the following table: — 



1 The mean of 17 days, 



- The mean of 19 days. 



