Volume 14 Australasia - dana ward's homepage

VOLCANOES OF THE PHILIPPINES. 249no lavas. The last outburst in IHHo destroyed all traces of vegetation in theisland.Bombon, wbicli is nearly 640 feet deep, was probably a vast crater, of whiclithe islet with its three volcanoes is merely the central cone, while the walls of tufa,over 600 feet high, encircling the north and east shores of the lake, arc the remainsFig.109.— Lake Bombon.Scale I : 300,000.^^ri^- {Lasb cF bf-eenwichISl'e'of the original rim of the crater. But, like that of the island of Saint Paul, thiscrater was formerly open towards the sea, as shown by the present intervening barrier,which is entirely composed of eruptive scorias. The water of the old inlet, thusconverted into a lake, is still somewhat saline, although constantly renewed by rainwater, and although the overflow is carried off by an emissary running south-westto the coast. The marine fauna inhabiting the lake has gradually adapted itself