162 Magnetic Disturbance on September 25th and 26thf IS^l. 



Tables exhibiting the mean diurnal change of the Declination, Horizontal 

 and Vertical Intensity, and the mean daily position of the several Initru- 

 ments during the month of September 1841. 



Dates and Extreme Ranges of the principal Magnetical Disturbances 

 observed at St. Helena. 



