THE GREAT EUUFITON OF SAKURA-JIMA IN 1914. 139 



mitted and cited on tlic fact of the presence of tlie parasitic 

 volcanoes of the Nabé-yama homatc^ on the east, and the Hikino- 

 liira dome and the Hakania-goslii patch, besides the lava-drowned 

 Karasu-jima on the west, on the supposed tectonic line (Text-fig. 10.) 



This argument is not at all conviiicinr/ to the writer, as the four 

 masses difier in age nnd are heterogeneous in their origin. The 

 writer admits the fact that the first is a true parasitic cone ; but 

 the nature of the second, — the Hikino-hira monadnock, is not yet 

 thoroughly established beyond doubt. It may be a volcanic plug 

 or a remnant of an edge of old disrupted slope, the rock being 

 identical with that of the north cone. The third, — the Hakama- 

 goslii patch, is a geologic block of sedimentary complex, dislodged 

 from the plateau of Kagoshima (p. 25), and lastly, the fourth is a 

 patch of ancient lava cap that covers the tliird (p. 26). 



In short, the writer is not in full accord with the view ex- 

 pressed to the effect that the series of ventholes or bocclie are 

 located on a traverse tectonic line in the fundamental structure of 

 tlie region. 



There are a number of ventholes both in the front and the 

 rear sides of Sakura-jima, of which some are only of ephemeral 

 character {see p. 74, Text-fig. 19). 



Ventholes y^^ ^^.-^p cOUUt 5 lava veuts OU the frouf (wCSt) 



ON THE "^ ^ ■' 



^\est ^-^i^^^ ^^^j ^I^^ ^^^ marked with a small circle is a 



mere epigonic blow -hole located on the edge of settling ground 

 (Text-fig. 27, and a small cross, x, in fissured terraces in back- 

 ground of Pis. XIV-XV.) in consequence of the defect of mass 

 which escaped in the form of fluent lava. No. 1 (Text-fig. 19) at 

 the nortli of the roundheaded Hikino-hira is a comparatively 

 insignificant lava orifice, 30 m. deep, which might have been very 



