ly alotig the beach, from which it rises a few feet. The beach at its base is a band 

 consisting of the upper edges of soft semidecomposed vertical laminae. Furiher on another 

 mass has its face composed of solid, slightly projecting nuclei of different shapes, with lami- 

 nae between. The nuclei are similar in composition to the preceding rock, but in the Iami- 

 nated portions the black mica is so thickly interspersed as to form about a third of 

 the whole. A quartzose vein about an inch in thickness traverses the face of the rock, cut- 

 ting through both the solid and laminated portions. Beyond this extended tabular rocks 

 occur, along the flat surfaces of which fissures and divisional lincs run in a direction NE. 

 by N . . . . SW. by S. A portion of the surface is covered with a ferruginous yesicular 

 crust, volcanic in appearance. The next considerable rock is a ledge running out in(o the 

 sea, about 80 feet in iength and 6 to 8 in breadth. A portion of it is marked by a net 

 work of contemporaneous veins of a larger grain and more micaceous than the body of the 

 rock; at some places the veins send tongues into the latter. This struclure is analogous to 

 that which the more decomposed rocks consisling of solid nuclei and laminated curved bands 

 exhibit. 



Along this coast wherever the junction of the rock with the superjacent soil of the hill 

 side is visible, there is, in general, an irregular band of angular fragments of the former 

 partially intermingled with the latter, evidently resulting from the slowly descending disin- 

 tegration of the rock; at some places however a layer of rounded pebbly stones is interpo- 

 sed between the broken surface of the rock and that öf the soil. An example of this occurs 

 here. The pebbles are chiefly of three sorts, — a porcellanous rock probably semidecomposed 

 granite and syenite — brownish red ferruginous rock, — and jaspideoüs. The first is by 

 £ar the most abundant. On the beach in the vicinity are numerous pebbles of the same 

 description, and also somé rounded scoriaceous stones similar to those which are so commoji 

 in Singapore. 



As the SE. angle of the Island is approached, regular spherical nuclei with concentric 

 spherical laminae are found. The most remarkable point in the character of the rock where 

 it assumes this structure is the abundance of black mica, which indeed constitutes the entire 

 mass with the exception of a little felspar which serves as a basis. It is to this circum* 

 stance that the tendency to this peculiar arrangement of the crystals is in all likelihöod 

 owing. The predominating rock around these laminated micaceous globes is greyish and faint 

 greenish quartzo - felspathic, with minute particles of mica and hornblende interspersed. In 

 decomposing it takes a rusty colour. It is obvious that the weathering of such globular fd* 

 liated portions of a compact rock , in situations where the whole was less preyed on by the 

 sea, would give rise to cups and spoon shaped cavities on the surfaces of the more compact 

 masses, and that rows of such spherical portions gradually excavated would ultimately as- 

 sume the appearance of groovcs like those formerly described (1). 



The SE. point has at one place the appearance of having been subjected to the action 

 ofheatsince the rock was formed. The sides of cleavage fissures have a blackish bro#m fer- 

 ruginous hue and a thin hard laminae or seam having the same character sometimes fills 



(I) Ante , p. 5, 6. 



