I 



Jour. Sc. Coll. Vol. XI. PI. IV. 

 Fig. 9. Pulsatory Oscillations on Sept. 6th— 7th, 1898. (NS component). 



Fig. 10. Pulsatory Oscillations on Oct. 14th-15th, 1898. (NS component). Fig. 11. Pulsatory Oscillations on Nov. 14th-15th, 1898. (NS component). 



Time scale (1 mm= 3.7 sec). 



^ , 1 — 1 1 minutes 



1 ü ,s 



