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SCIENCE PROGRESS 



Sakura-jima is roughly elliptical in form, six miles long 

 from east to west and five miles wide. Near the centre of the 

 island are two lofty peaks, the Minami-dake or south crater, 

 and the Kita-dake or north crater. These peaks, which are 

 respectively 3,509 and 3,719 ft. in height, are connected by a 

 slightly depressed ridge rather more than a mile in length. In 

 the south-east of the island there is a flat ring-shaped parasitic 



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\ Su'waiiOSe'vlliua 



Fig. I. — Map of the volcanic chain of South Kyushu. 



cone, the Nabe-yama, 1,087 ft. high. On the west side, the 

 most conspicuous crater is that of Hikinohira, 1,814 ft. in 

 height. The total volume of the island above sea-level is about 

 6\ cubic miles. 



Epochs of Volcanic Activity in Japan. — The four large 

 islands of the Japanese empire, Hokkaido, Honshu, Shikoku, 

 and Kyushu, lie along a great arc, the convex side of which 



