AND THE NEIGHBOURING ISLANDS. 163 



Near the centre of this side, about one hundred yards from the shore, is 

 a small detached rock, resembling, at a distance, the ruins of an Indian 

 Pagoda, entirely composed of a soft red clay, impegnated with iron, 

 (No. 37,) similar to what is called Geru by the natives of India, and 

 which, like it, might be used as a coarse paint. The lowest stratum of 

 the southernmost Pulo Kra, is a very hard compound rock, which, for 

 want of a better appellation, I have called grey wacke, composed seem- 

 ingly of quartz and felspar, very compact and of a blackish blue colour, 

 traversed by numerous veins of quartz, large and small, in every direction, 

 (No. 38). The upper rock is the same argillaceous schist as that com- 

 posing the northernmost. This structure is well seen at the south-west 

 point of the Island. 



JBcitla Kaivang, on the main-land less than a mile cross from Pulo Kra, 

 is composed entirely of granite. It is a hill about two hundred and fifty or 

 three hundred feet high. Behind it are extensive sugar plantations. The 

 soil is a fine rich clay mixed with sand. On the east side of the hill, beds 

 of potter's clay occur, from which the coarse conical pots, used in the 

 manufacture of sugar, are made. The small hills along the coast of 

 the main-land opposite Pinang, are, I understand, entirely composed 

 of granite. On this subject, however, I shall not enlarge, as Captain Low 

 has already published an account of their structure in the First Volume of 

 the Transactions of the Physical Class. For the most part the ground is 

 alluvial, and, as stated by Mr. Finlayson, in his account of the Mission 

 to Siam, in some places, resembles peat-moss. 



Such were the observations which I made on two tours round tliis 

 Island, in which every part described was carefully and minutely exa- 

 mined. Specimens of the rocks accompany, which speak lor llicnisel ves. 

 I am unwilling to obtrude my crude rcniaiks on the Sociciy, but I think 



