a heavy storm, leaving a a detached pillar to guard the Core. The Grande Vigie, at the extreme northern point of Grande Terre , is a similar detached column standing out from the like a man or guard. Mainland X: The process of forming making such an arch is illustrated in a little core two hundred yards east of the Porte, where the sea has excavated and is enlarging a pretty little grotto. The work is aid- ed by the jointing of the lime-stone. 21 30-B In this region the upper 60 or 70 feet of the limestone com-posed of an agglomerate composed of large masses of Meandrina and other corals.