!i 



rock is one rudely rounded mass and apparently composed of concentric layers. Towards one 

 side a wide chasm penetrates it leaving at the eastern angle a columnar portion di- 

 vided by a horizontal fissure into two rounded blocks of which the upper is still at the 

 top connected with the mass. The neck of junction consists of the remnants of nuraerous 

 layers wedged in as it were , one half with their convex sides to the spectator or embra- 

 cing the rock above and the other half with their concave sides towards the spectator or 

 capping the block beneath , thus presenting the appearance which a number of somewhat 

 stiff sheets of paper or other flexible substance do if they are compressed tightly in the 

 middle and their ends made to diverge on both sides. 



Beyond Pulo Tam a point occurs from which a large furrowed rock advances into the 

 sea. This I inspected with some minuteness. The channels, even on the same face , run 

 in different directions so that they sometimes cross ; but , more frequently , after meeting , 

 one only is continued. In all cases thèy evidently occupy the lines of division or imperfect 

 cohesion. On the side facing the NW. the direction of the larger ones is nearly NE. 

 and NW. On the S. side they are deep and face the S. These latter it appeared to me 

 had been gradually excavated by the alternating action of the sea and the atmosphere. A 

 little further to the E. the gutters of the rocks faced NE. by N. nearly ; at one place 

 the rock is nearly worn through and the breach is half filled with large angular frag- 

 ments, the remnants of the layer or ledge which had originally occupied the cavity. lts 

 sides are parallel and mark two planes of division. The furrows beyond this were gene- 

 rally in one or other of two directions according to the slope , that is eilher facing the 

 NE. by N. or WNW. nearly. The general surface at some places is uneven, which oc- 

 casions varying slopes, and it appeared clear that the directions of the furrows at these 

 places were fully explained by the directions in which the slopes would cause the rain 

 currents to run down them. In many cases , the latter did not exactly coincide with the 

 former , because no fissures or lines of division did. But of the two systems of parallel 

 divisional lines by which the surface was intersected , that which most nearly agreed with 

 the slope had given their directions to the gutters. Where the face of the rock was slightly 

 hollowed the gutters converged. The ridges between the divisional lines are sometimes 

 crossed by gutters but only where this would be rendered necessary for the descent of the 

 water. 



It was not until I had examined both the eastern and western portions of the Island that 

 I was able to revisit the point where my acquaintance with it had commenced. It proved 

 that I had seen only one small section on the S. side, and that the SE. and E. faces 

 possessed the principal rocks. These stand in great profusion along the beach or rise from 

 the water in front, while the hill behind appears like some ancient «castled steep" with 

 remnants of flanking walls midway up, and broken battlements frowning from the suramit. 

 Many of the piles are on a grander scale than any that are found elsewhere; they have a grea- 

 ter air of antiquity ; and rising as they do in diversified forms, — here in solid cubical masses , 

 there traversed by deep chasms and bristliUg with sharp pinnacles, at one place standing 

 out in full relief in their grey mossy coating, and at another covered with a trellis work of 

 roots, trees ascending from their summits into midair, and the entire rock buried under 



