Plate XXIII. 



Plan. — Form of the crater as deduced from the triangulation 

 survey. The contour lines in the crater indicate roughly the 

 principal elevations and depressions. 



X The original top of Kobandai which is in the line of the steam 



fissure. 

 # Principal stenm fissures. 



Section. — The profile of the crater through the line A B, or the line 

 passing through the original top of Kobandai and the highest 

 part of the crater-wall. The dotted line shows the part that was 

 blown away. 

 The heights are given in metres. 



