116 



S. SEKIYA AND Y. KIKUCHI 



height of 1,840 metres (6,035 ft.) above the sea, and enst of it, Kushiga- 

 mine, the third peak of the Bandai group, with an altitude of 1,622 

 metres above the sea. Between them is Numano-taira, the large 

 flat basin of the old crater, with 1,311 metres above the sea-level. 

 At the base of the huge U shaped aperture formed by the slopes of 

 the two mountains the Biwa-sawa begins to descend. Fig. 1 on the 

 wood-cut shows roughly the relative positions of the peaks and the 

 old crater in plan, and Fig. 2 shows a vertical section through A B. 



Yugeta^x 



Fig. 1. 



Öbandai Numano-taira Kushiga-mine. 



Fig. 2. 



Section thi^ough A B. 



Xow, when the steam emancipated by the eruption s iddenly ex- 

 panded and drove before it the surrounding air, a portion of this air 



