On Rapid Periodic Variations of Terrestrial Magnetism. 3 



2. Observatory. — The observatory is situated at the foot of 

 the northern slope (139°37'*5 E, 35^9'*4 N.) bordering the Bay of 

 Aburatubo, ^lisaki. Province of Sagami, a few minutes walk from 

 the Marine Biological Laboratory belonging to the College of 

 Science, Imperial University of Tokyo. The station was chosen 



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