Essay, Cc. 243. 
ima state of partial decomposition. Green-stone, 
Hornblende and Osidian are also observed. 
The external surface of this rock, especially 
where it isexposed to the action of water, is also 
greatly diversified, and often exhibits very gro- 
tesque figures: the minute particles of sand, &c. 
having gradually been carricd away, the large 
fragments, projecting, form a very uneven sur- 
face. From the foot ofthe hill, at the common 
place of passing the Chiching-goleng, I traced 
‘it to the discharge of this river; here immense 
ivasses are heaped together, covering an exten- 
sive tract. At the termination of the hill several . 
caves exist, and in one part a vault completely 
penetrates an extremity of one of the parti- 
 eular ridges. This is denominated Karang- 
bollong literally ** hollow rock” and has given 
the name to the whole settlement. The vault 
- here is very explanatory of the constitution of 
“the caverns in which the Edible Bird’s-Nests are 
formed ;- ón the whole it agrees with the rocks . 
above described, but many of the separate frag- 
ments are of considerable size, exceding 6 or 8 
inches in diameter : the largest of these are Ba- - 
saltes. One of the Native chiefs, employed to 
superintend the collection of this production, ac- 
companied me, and pointed out the similarity of 
- Karang bollong, to the caverns in which the 
had an opportunity of determining by personal 
observation. To the projecting fragments of the 
Pudding stone the cords are attached, which 
support the ladders and bridges employed in 
gathering the nests, and on this: the collector- 
* Exp. Cat, No. 5 and 6, 
