POPULAR SCIENCE 107 



ling in the district surrounding Sakura-jima. A series of levels 

 was carried out by the Military Survey from December 1891 to 

 January 1895. This was repeated at various times between 

 July 1 9 14 and May 191 5. The heights of the bench-marks 

 along the railway-lines near Kagoshima Bay were also re- 

 determined in April and May 1915, the first series of levels 

 having been made between 1897 an d 191 3. 



The results of the re-surveys are shown graphically in Fig. 3. 



300 



\ 



V 



Kagosfciroa 



Q Sakura-jima 

 Jl • ' 



Kagoshima 

 Bay 



100 



Fig. 3. — Vertical crust-displacements in the district surrounding Sakura-jima. 



On this map are shown the curves of depression of 100, 300 

 and 500 mm. The two last curves, it will be noticed, sur- 

 round the northern end of Kagoshima Bay. The axes of the 

 curves intersect in a point lying a short distance to the north 

 of Sakura-jima, and this point Prof. Omori regards as indicating 

 the site of greatest depression of the ground, and as probably 

 coincident with the principal centre of the underground lava 

 reservoir. The latter, as he points out, may extend under the 



