JOURNEYS THROUGH KOREA. 59 



it generated the hematite now accumulated in patches. The pres- 

 ent rock resembles, petrologically as well as geologically, the 

 mitsu-ishi stone of Bizen province Japan, where the rock is now 

 being extensively quarried making good refractory bricks and 

 slate pencils. TJie oh-mai stone may be advantageously employ- 

 ed for the same purposes, and commercially it promises to be 

 very valuable. 



Retracing our snowy path for a short distance and then 

 proceeding north-west, we passed a stone-gate supporting a 

 guard tower, at the low and narrow haulover (PI. Ylll.fig. 1) of 

 Uön-mun^^, which proctected the Naval station of U-su-yöng^^. 

 Here the people were working the ok-mal stone. In the vicinity 

 of the place last-named, the same ash-gray brecciated felsophyre 

 reappears with green flecks, this time with abundant bipyramids 

 and corroded crystals of quartz which project like needle-heads 

 on the wave-beaten surface at the water's edge, thus presenting 

 a craggy appearance. 



Usu-yöng (PI. Ylll.fig. 2) is the western entrance of the far- Usu-yon« 

 famed whii'lpool already mentioned. It was the Naval base of 

 the Korean Admiral I-sun-sin ^^ of well-deserved fame, who an- 

 nihilated our armada during the war of 1592-1598 by luring our 

 armed junks into the fatal whirlpool (PI. VIII. ßg. 3). I actually 

 photographed an ancient anchor which for three centuries had lain 



No. 5 Above No. 20 of the Seger normal cone. 



No. 6 Above No. 30 



No. 7 



No. 8. Above No. 21 



No. y Above No. 29 



No. 10 Above No. 30 



No. 11 



No. 12 Above No. 25 



1) ^ P^ ••^) * 7lc =^ 3 ) ^ ^ E 



