174 



AKT. 'ô. — B. KOTÛ : 



the west higona or fiery blast holes (Text-figs. 37 [3-4], 11), besides 

 the third, which lies a little lower. The vemtholes lie at about 

 700 ??^ above sea-level. Three other bocche, the fourth, the fifth, 

 and the sixth,^^ 

 are located be- 

 tween the 200- 

 and 300-meter 

 contours on the 

 shelf formed by 

 stemming of vis- 

 cous lava-flows, 

 and they are pro- 

 bably secondary 

 vents, burst open 

 by local ac- 

 cumulation of 



gases in a tunnel Fig. 38. — The sixth venthole in the northeast lava-field of 1779. 



See Text-figs. 10c, 11, :53, 37 and (reologic Map. 



within the cool- 

 ing lava stream. The Komen lava spread out into two branches 

 overwhelming the once large village of Mukômen {see Text-flg. 11), 

 and enclosing the triangular area of the old Urano-mayé lava-field^^ 

 of 1471. 



h) Pétrographie Characters of Hypersthene-andesite.— «) The lava 

 of An-ei-San has the same black appearance as the other historic 

 lavas, differing only slightly in lustre and in the sporadic oc- 

 currence of olivine— n. component which is for the first time plainly 

 observed in the lavas of Sakura-jima (PI. X\7n. Fig. (5). The 

 lavas are all of hypersthene-andesite. 



1) The last lies on the roadside, 'J'ext-fip. 3S. 



2) See page 163. 



