Jour. Sc. Coll. Vol. XI. PI. V. 



Fig. 12a. Pulsatory Oscillations on Dec. 18th— 14th, 1898. (EW component). 



Time : 1 tick interval = 1 minute. 



Pig. 12b. Pulsatory Oscillations on Dec. 13th— 14th, 1898, (EW component) 



Time ■ 1 tick interval = 1 minute- 



