Jour. Sei. Coll., Vol. XXXVII., Arl. 9, PI. II. 



Chanicteiistic day record. Note the short waves in the moiiiiiig. In this example simik 



March 17, 1913. (Eeduced to J original size). 



^"N 



T. Terada. On Rapitl Periudic Variatious of Terrestrial Maguetiaii 



