3 ART. 2,— S. YOSHIWARA. 



Kak(M'»)iiia-jiin;i, wlicri' ho stayed a week on arcount of bad weather, 

 and returned to Ivcjniya in (Jshima. Then lie went through Akina, 

 Jchi, (lusukii and Asato, and returned to Xase on August 80th. 

 Acc(ji'ding to liis observations, tlie ishmd consists of Archean rocks, 

 which are ehieHy graiiulite and gneiss, only a small exposiu'e of 

 granite was found. There was also a bluish black clay slate at Cape 

 Jsisaki near [clii. and a thin ln^rizontal bed of recent (?) conglomerate 

 at the harbour of Xase. lie also explained the (h:)uble-ro\v structure 

 of the islands in the northrni part of the sea between Formosa and 

 Kyushu. The outer row including Tanega-shima, Yaku-shima, 

 Aniami-Oshima. 'J'okuno-shinia aiid Okinawa-jima is sedimentary, 

 while the inner row consisting of Kume-jima, Tori-shima, Linschoten, 

 Erabii-jiina. Kose-jima, Yuo-jima and Tage-shima is entirely volcanic. 

 This was mentioned liy E. Suess in his '" Antlitz der Erde, l>d. IL, 

 1888, p. 219;" and he remarked that tlie Kiukiu Group might possess 

 the same structure as the Antilles, Banda, Xicobar and Andaman. 



Wit!) the exception «^f the above mentioned authors, I have failed 

 to tind anv foreio;n oreolo<rical observers, who have studied the sreoloofy 

 of the liiukiu C'urve. The islands have not been jnuch visited on 

 account of their lack of facilities for travel in their interiors, and also 

 Ijecause of the presence of darigerous snakes and fevers. A very rough 

 geological note M'ith a map of the two groups, Okinawa and Saki- 

 shima, was pubHshed by Mr. T. Kinhi 'u\ " 111 e Journal of tit e Tokio 

 (ieographiad Socielij, 7th year, Xo. 5, 1(S85." A brief topography of 

 the same islands has been written by Messrs. Kuroiwa and Xakayoshi. 

 Mr. Kuroiwa's ''General (ireological Observations in Kume-jima and 

 Ishigaki-jima " is found in "'i7/f' Journal of tlie (jrcological Societi/ of 

 TOhjö, Vol. \'. \o. 59, 1898 and Vol. MI, Xo. 71, 1899"; that of 

 Tanega-shima and Yakushima by Mr. Xishiwada in "T/i^j Journal of 

 Geograph ij ^ piililished hij (he Tokyo Geographical Society, Vol A II, Xo. 81, 



