Volcano Ôshima, Idzu. 



37 



t)ottoin or about 6 m. above Kawajiri {K) with a circalar pit, 

 about 70 m. across and facing to S.S.E., rather large for the 

 size of the cone. At the southeastern foot of tlie spatter cone, 

 A, there is a wide ditch, d. The other one of the two con- 

 spicuous elevations, B, is a dome-shapod lava-mass the top of 

 which is about 4 m. below Kawajiri, K. At the southern foot of 

 B is a hollow, p, which is probably the remnant of a pit. The 

 area to the south of the ditch, d, shows very irregular relief, the 

 point marked c, about 50 m. below Kawajiri, being the lowest. 



Fig. 22. The inside of the Mihara crater in the summer of 1916, look- 

 ing down from the southwestern margin of the crater (Fig. 1, 21). The 

 reference letters, K, A, V, and d, correspond to those in Fig. 20. 



The whole crater is at present a state of deep tranquility. 

 No motion is seen and no sound is heard to cause any uneasiness. 

 Activity is only indicated by fumes with a faint peculiar choking 

 odour of sulphur dioxide, which is the characteristic gas at less 

 active vents according to the law of variation in composition of 

 volcanic gases, first established by Sainte-Claire Deville, namely, 

 that the nature of the gas evoluted depends upon the phase of 

 volcanic activity. The fumes rise calmly at varying places, from 



