RECOMMISSIONING THE CARNEGIE 27 



Cruise VI in 1921. The chief aim in the present voyage was 

 to reoccupy many of the former positions in order to note the 

 changes which had occurred with the lapse of time. There had 

 been disclosed on earlier expeditions areas of local magnetic 

 disturbances, and these too must be studied again. These con- 

 siderations determined to a large extent the course we followed 

 in traversing the oceans; but here and there a compromise with 

 the requirements of the ocean-studies had to be effected. 



