228 CONTENTS. 



TAGE 



a) ]Mocle of occurrence, 166 — The four pits, Nos. 1-4, 

 167 to 168— The vent No. 6 (the Taka-cliiki vent) . . 169 



b) Pétrographie characters of joyroxene-andesite, 269 — TJie 

 land and shore lavas 169 



C. The Ohira-yama lava field of 1749 170 



«) Mode of occurrence 170 



h) Pétrographie characters of pyroxene-andesite 171 



D. The An-ei lava of 1770-1781 172 



o) Mode of occurrence, 172 — xin-ei-San, 172 — The Komen 



lava-field 172 



h) Pétrographie cliaracters of hypersthcne-andesite, 174 — o) 

 The Au-ei-San lava, 174 — /5) The Konien lava, 175 — 



Y) The rocks of the iVn-ei islands 176 



III. General Petrographic Characters of the Lavas of 



1914 176 



A. 3Iasslve lavas 17<) 



0) Land lavas in general, 176 — Hypcrsthene-andesite, 176 



— The colors of lavas, 178 — The a and ß tyjx3S. . . . 180 



b) Chemical characters 180 



c) Submarine lava-flows, 181 — The lavas of the western 

 field, 181— The lavas of the eastern field 183 



fJ) Characteristics of the icestern and eastern lavas, 184 — 



Phenocrysts, 185 — The gronndmass 186 



J^. The loose éjecta 187 



1) Volcanic scums, 187 — Spongy thread-lace glass scoria, 

 187 — Ceramicites, a new group name, 187 — a) White 

 scums, 189 — ß) Gray scums 187 



2) The gabbroids as éjecta, 190 — -The a type, 

 Microtinite, 190 — Tiie ß type, diopside-gabbro, 191 — 

 The Y type, lithoidal microtinite, 192 — The d type, 

 micronoritc, 193 — The s type, micro-allivalite, 194 — 

 General explanation 195 



