116 



those that were inserted, during my journey, in several pub- 

 lic papers (Journ. de Phys. t. iv, p. 433j Mag. Encyclop. an. 

 8, p. 376 ; Zach. Monatl. Corresp. t. i, p. 402), arise from my 

 having sometimes neglected taking the average between the 

 observations made to the east and the west, and because the 

 latitudes and longitudes observed had not always been reduced 

 by estimation to the same time, when the magnetic dip had 

 been determined. 



