ON ITS EXTERIOR. VOLCANOES. 363 



active volcano; we are indeed only acquainted with 

 some narrow strips of coast (on the north side as far as 

 the little island of Labuan and Cape Balambangan, on 

 the west coast to the mouth of the Pontianak, and on 

 the south-easternmost point the district of Banjermas- 

 Sing on account of its gold, diamond, and platina 

 washings) : nor is the loftiest mountain of the whole 

 island, (perhaps the loftiest in any of the South 

 Asiatic islands,) Kina Bailu, with its two summits, of 

 which the northern is only about thirty-two geogra- 

 phical miles from the Pirates' Coast, supposed to be a 

 volcano; Captain Belcher found it about 13,700 feet 

 high, or nearly 4000 feet higher than Grunung Pasaman 

 (Mount Ophir), in Sumatra. ( 492 ) But on the other 

 hand, Rajah Brooke mentions a much lower mountain 

 in the Province of Sarawak as bearing the name of 

 Grunung Api (Fire Mountain in Malay), which name 

 and the scoriae which surround the mountain would 

 indicate a former state of volcanic activity. Great 

 deposits of auriferous sand between quartzose dykes, 

 much tin washed down on both banks of the river, and 

 the felspathic porphyry ( 493 ) of the Serambo mountains, 

 indicate a great diffusion of so-called primitive and 

 transition rocks. From the only well-assured determi- 

 nations which we possess from a well trained geologist, 

 (Dr. Ludwig Homer, son of the meritorious Zurich 

 astronomer and circumnavigator,) washings are carried 

 on at several places in the south-east of Borneo, in 

 which process gold, diamonds, platina, osmium, and 

 iridium are found, as in the Siberian Ural (but hitherto 

 no palladium). A range of hills 3410 feet high, the 



