Jour. Sel. Coll., Vol. XXXVII., Arl. 9. PI. IV. 



., oiiginated at a sontlierii imi-l of North Pacific: Mai'cli 1 4-1 5, 1918. (Eeduced to J origmal size)- 

 T. Terada. On Rapid Periodic Variations of Terrestrial Magnetism. 



