268 



SEKIYA AND OMORI. 



distributed more or less in groups. Here ngain the pit diagrnm 

 appears niucli smoother than the surface one ; compare, for instance, 

 the portions marked a, b, c, d, e, f, g, iii the E, AV. comjionent. To- 

 wards the end, tl\e motion becomes slow. 



E. AV. Component. 



(I.)— Ripples.— E. W. Component. 



