1366 LEAFLETS OF PHILIPPINE BOTANY [Vor. IV, Art. 71 
the left, around a prominent sharp shoulder reaching to the lofty 
roof. On the right is a large elevated cavern with two promi- 
nent pillars near the bank of the stream. This 1000 meters 
is characterized by the increasing size of the chambers, and by 
mud banks piled in shelves in side pockets. These banks are 
rare in the lower portions of the river, but after reaching this 
point they become increasingly apparent, both where they are 
piled in the recesses by flood water, and at short stretches, first 
on one bank, and then on the other. 
“Proceeding upstream from the prominent chamber above 
mentioned, the section contracts to one similar to the straight 
channel as described between the 500 and 1500 meter points, 
but on a somewhat larger scale. This continues for about 300 
meters, or to about 3000 meters from the entrance, where, after 
a slight reverse curve, the cavern opens into a series of chambers 
considerably larger than any previously encountered. This 
succession of chambers continues for about 1000 meters, or to 
the 4000 meter point, where the survey terminated. In this 
last section the side walls frequently recede from the stream, 
which is left to meander between mud banks on either side, while 
the roof rises in places to heights estimated at over 30 meters. 
The depth of the stream diminishes, so that it is frequently 
necessary to maneuver the boats to avoid grounding on shoals. 
“At about 4000 meters the stream is entirely blocked in a 
small pool, from which a noticeable current flows downstream 
but into which no current could be found entering. The pool 
is bounded on the right by a solid rock wall, but its left side 
consists of a pile of boulders and loose debris perhaps 12 meters 
in height, and lying just beyond an immense column supporting 
two roof arches. So far as is known, progress in boats is im- 
possible beyond this point, and the party making this investi- 
gation had not enough time at its disposal to attempt to con- 
tinue the survey on foot. An ascent was, however, made to the 
top of the rock heap which barred further progress, and it could 
be seen by means of an electric hand lamp that there was a 
continuation of the cave in the distance beyond. Whether this 
opening contained water was not ascertained. The last point 
reached lies about 1000 meters N. N. W. from the peak of St. 
Paul Mountain, which is given an elevation of 1027 meters on 
the charts. : 
uc wl 
