AND THE NEIGHBOURING ISLANDS. 



157 



isolated strata of grey marble,* (No. 44,) of fine grain, and highly crystal- 

 lized, dip at an angle of little less than 45° to the westward. 



3. ^ — Pulo Sonsong is about three miles to the northward of Pulo 

 Panghil; a mile and a half in length, and about one broad at its southern 

 extremity. At the landing place, a small sandy point, we observed some 

 masses of coral rock, close to the beach, and the whole coast was covered 

 with broken pieces of white coral thrown up by the waves. The island is 

 rocky and bold all round, and as usual thickly covered with wood. The 

 rock (Nos. 46 and 47,) is entirely argillaceous, running in regular strata, 

 at an angle of more than 65°, and dipping to the eastward. On the 

 beach it presents more of the schistose or lamellar structure, (No. 46,) 

 and is every where traversed by veins of quartz, (No. 49,) with a coating 

 of a black substance, (metallic I) On the south and east sides, and 

 apparently forming the lower strata of the island, the rock is of a 

 reddish color and soft, (No. 47). On the west side, which is particularly 

 bold and precipitous, it is of a bluish grey colour, soft and silky in 

 same places, presenting the slaty texture, (No. 48,) but not splitting into 

 thin lamellfE as regular clay-slate does. On this side are numerous 

 caves ; and the precipices crowned with lofty trees, the immense frag- 

 ments of rock, the dashing of the waves against them, and the hollow 

 sound of the water rushing into the caverns, have all an imposing effect 

 on the observer. 



4. — Pulo Boonting, about four miles north of Pulo Sonsong, is of 

 nearly oval shape, thickly covered with wood, about one and a half 

 mile long, and one in brcathh at its broadest part. It is precipitous 



* This is well atlnptcd for arcliitectural purposes: and is fully equal to that brouglit from 

 China at considerable cxpence — I am now aware that its existence in the neighboiuhood was known 

 heretofore. 



