Essay, Ge. 285 
descent of this mountain, and which constitutes 
one of the most stupendous vestiges of the 
ancient inbabitans of this I:land; in a fragment 
of one of the slabs of which. the stair is cong 
structed, among the explanatory specimens 
nexed to this Essay, the fracture exhibits 
various foraminula filled with a white siliceous 
stalactitical substance, the rest is composed of 
quartz and hornblende, through which mica is 
#sparingly dispersed. This mountain, as well 
as the Diyeng, contains several extinct volcanic 
apertures which at the present erm are filled 
with water, and constitute ,,Te/ogos” or lakes 
according to the denomination of die natives. 
From the Telogo-jeburg the whole mountain 
has been named; zt the foot I observed the 
Telogo-menjer near a village of the same name. 
The descent of the mountain to rhe village 
yu- Rangkang, near the lakes last mentioned, 
is very sudden, and the perpendicular elevation . 
from here to the summit is at least 1500 feet. 
From the village Kayu-Rangkang to theriver 
Serayu, which i crossed near the Chinese farm 
of Jawar, the descent is gradual, and only 
interrupted by the ravines descending from the 
neighbouring mountains, and meeting reach other 
from various directions. The Serayu flows 
hir rapid current from north to south, aris- 
from the hill Jajar, near the Fastern 
dcclivitics of the moutain Prow: its basin is 
strewed with large rocks of Basalres. 
On the route from Kayu- -Rangkang towards 
the south, I observed onthe sections ofthe hills 
that were accidentally exposed, Tufa of various 
- € Ea 24 ER Cat. No. 7o. 
Na 
