36 Vol. XLIII., Art. 6. — S. Tsuboi : 



1913 whieli was an extmsion of lava duo to the depression of the 

 lava layer at the crater-bottom. The fifth eruption, a magnificent 

 lava outburst in May 1914, strikingly changed the feature of the 

 inside of the crater. The lava came to a level of 14 m. below 

 Kawajiii, entirely burying the old cones under newly erupted 

 materials and forming several new ones on the crater-bottom. 

 Cessation of activity was immediately followed by the beginning 

 of the depression of the crater-bottom. After this eruption a very 

 small activity took place in 1915, l)ut this did not mucli modify 

 the state of the crater. 



Fig. 20 is a sketch map based on the writer's eye-measure- 

 ments in the summer of 19 IG, showing the feature of the inside 

 of the crater at that time. The bottom of the crater appears, 

 at first sight, to be almost horizontal, being filled with the 

 lavas (now broken into fragmental blocks) of the last eruption. 

 Along the foot of the encircling wall of the crater there is a 

 narrow strip of land (30 m. below K) which forms two terraces 

 (fi and t.) at the foot of Kawajiri. This was formed by the 

 sinking of the ground due to its own weiglit, soon after 

 the last activity ; and ti corresponds to the level to which the 

 lava was raised in the last eruption. Omori states that these 

 terraces were in existence on his visit a week after the eruption 

 of May, 1914. The surface of the dislocation wall is vertically 

 grooved and striated. There are, on the crater -bottom, several 

 elevations — spatter cones and tlieir ruins — which are denoted in 

 Fig. 20 by A, B, C, D, E, F, G, H, I, and J; of these, the 

 largest two, A and B, are combined in a long continued hill which 

 is pretty well preserved on the northwestern side but is in a stats 

 of collapse on the opposite side. A is a spatter cone formed by 

 the last eruption, being elevated about 25 m. above the crater- 



