H. Slmotomal — Tarumai Dome in Japan. 



91 



of the dome. One of the large trenches begins at the south- 

 eastern periphery of the top-area, a little northward from the 

 termination of the fissure on the inner crater-wall, and runs to 

 i^r.60°W., in the same direction. 



Towards the center of the dome the trench gradually loses 

 its character, but at the other end it is 50"" wide and is bounded 

 on both sides by steep slickensided cliffs which are locally 

 about 20™ higii. Within this depressed zone, many minor 

 fissures run in the same direction ; some of them are open and 



Fig. 3. 



^ Fig. 3. Tarumai after the eruption of 1909. 

 place as fig. 2, with, the new pier in front. 



Seen from about the same 



about 10""' deep. Another large depression runs from the cen- 

 ter of the top surface and goes to J^.N.W., and its breadth is 

 about 60"". Its maximum depth lies a little distant from the 

 center and forms a long, oval basin about 20"" wide, and its 

 bottom is 30™ under the highest point of the dome. 



Moderate amounts of sulphurous gas are issuing through 

 these numerous fissures. Prof. Kusakabe in Sendai, who 

 visited Tarumai in August with us, reported to me that the 

 photographic films which I took on the donie for his party 



