50 



ART. Ô. — B. KOTa: 



Fig 12. — The Inoko-jima rock in foreground and 



Silin- jima >S' in distance — the two new islets of 



177Ü-1780. (After Yamaguchi.) 



Iwô-JiMA Nos. 3 and 4. Tlie former a,i>i^eai'ed on December 



(Nos. 3-4) 



1779-1780 13th, 1779, at a distauce of 1,600 m. (15 c//o) eastward, 

 and the latter near by (6 eJio) on Jaunaiy 15th, 1780 ; both are rocky, 

 and once emitted Ja sul- 

 phurous odor. The two 

 afterwards coalesced into 

 one. It is Iwo-JIMA 

 (Kuro-shima or Se- jima) — 

 the ' sulphur island.' This 

 compound islet appears 

 hook-shaped during low 

 tide, as if it were a sub- 

 merged rim of a small 

 crater- wall. This is the 

 only new islet built up of 



Avliite-spotted black rock'^ that the writer has seen among the new islets. 

 See Fig. 13, I. 



Shin-jima 2^0. Ô. Two islands welled out on May 11th, 1780, in 



(No. 5) J ' ' 



1780 the direction S.S.W. at a distauce of about 1,500 ?w. (14 <7<o) 



from No. 4. On June 3rd, they amalgamated into one. This is gourd- 

 shaped, pumiceous, and the largest island (700 l)y 450 w.\ and received 

 the name Shin- JIM A (An-ei-jima or Moye-jima). Many people went 

 out daily in boats to see the remarkable spectacle displayed by submarine 

 eruptions near the present west coast of the island, where on April 21, 

 1781, one of the vessels was hurled up by a paroxysmal outbm'st, killing 

 twenty-three of the sight-seers. The island is a goiuxl-like island in 

 plan as well as in relief, lying prostrate in meridional direction 

 (Text-figs. 12 and 13, S). In the Ioav central portion there is a group 

 of fishermen's cottages. It is built up of a lapilli-ash bed (A) underlain 



1) The blafik rock is dense and somewhat slaggy. Phenocrysts are of the same habits as 

 in rocks of Saknra-jimn. Brown glass is full of augite-microlites diisted with magnetite. A few 

 elongated enstatite-augite (?) crystals with resolved terminations and skeletal forms are also 

 occasionally found. 



