PLATE XXIII. 



Microscopic textures of various ejectamenta thrown out during 

 the eruption of 1914. 



Fit»'. 1. — ^Fritted friable granite-block, iiiulcr (a-os,sed iiiculs, ejected from the 



hidden foundation of the volcano. Quartz is cracked, ortlioclase pseudo- 



phitized and biotite impregnated with i)yrrliotite along cleavage plane. 



See pages 30, 216. 

 Fig. 2. — The so-called sandstone, which is really a glass-soaked pumice layer 



of the Plateau For j nation of southern Kyushu. Biotite is fresh (not 



found in the photomicrograph), but the rhomb-sJiaped hornblende is 



opacitized. See page 216. 

 rig. '">. — Trass or a loose aggregate of heterogeneous constitution, mainly built 



up of lapilli of biotite-hornblende andésite soaked witli opal-like isotropic 



substance. Sec .30, 212, 214. 

 Fig. 4, — Porphyritic obsidian of hyjiersthene-andesite, found as blocks at an 



altitude of 400 m. above the coastal village of Ari-mura. The brown 



glass in the groundmass shows the characteristic kneaded and damascened 



texture. See pages 186, 212. 

 Fig. 5. — Pumiceous lapilli with hypersthene that rained at the Experimental 



Station of the Ivagoshiina Agricultural College, at a distance of 11 km. 



from the Nabé-yama vents. See page 211. 

 Fig. 6. — Crystals of hypersthene, plagioclase and clumps of magnetite from 



pressed lapilli that thi(;kly cover the coast of Prov. Osumi (Tabé). See 



pages 118, 211. 

 Fig. 7. — Wash-skeleton of ash that fell at Kokubu Station during the first 



phase of activity, at a distance of 20 hn. Minerals found are idiomorphie 



hypersthene, allotriomorphic plagioclase and a subordinate quantity of 



magnetite clumps. See page 118. 

 Fig. 8.- — Ash that fell in Tokyo, at a distance of 1,000 hii. from Sakura-jima, 



being mainly composed of minute sjilinters of colorless strained glass full 



of air-pores. It is the lightest portion of connnimited lu]>illi. See pages 



72, 118. 



