ore
or less decomposed trachytic fragments of hornblende rock, the
spaces between which were filled up with red sand. The number of
streams sent down by the Isarog, into San Miguel and Lagonoy bays,
is extraordinarily large. On the tract behind Maguiring I counted, in
three-quarters of an hour, five considerable estuaries, that is to say,
above twenty feet broad; and then, as far as Goa, twenty-six more;
altogether, thirty-one: but there are more, as I did not include
the smallest; and yet the distance between Maguiring and Goa, in
a straight line, does not exceed three miles. This accounts for
the enormous quantity of steam with which this mighty condenser is
fed. I have not met with this phenomenon on any other mountain in so
striking a manner. One very remarkable circumstance is the rapidity
with which the brimming rivulets pass in the estuaries, enabling them
to carry the trading vessels, sometimes even ships, into a main stream
(if the expression may be allowed), while the scanty contributions
of their kindred streams on the northern side have scarcely acquired
the importance of a mill-brook. These waters, from their breadth, look
like little rivers, although in reality they consist of only a brook,
up to the foot of the mountain, and of a river's mouth in the plain;
the intermediate part being absent.

[Comparison with Javan Mountain district.] The country here is
strikingly similar to the remarkable mountain district of the
Gelungung, described by Junghuhn; [146] yet the origin of these
rising grounds differs in some degree from that of those in Java. The
latter were due to the eruption of 1822, and the great fissure in the
wall of the crater of the Gelungung, which is turned towards them,
shows unmistakably whence the materials for their formation were
derived; but the great chasm of the Isarog opens towards the east,
and therefore has no relation to the numberless hillocks on the
north-west of the mountain. Behind Maguiring they run more closely
together, their summits are flatter, and their sides steeper; and they
pass gradually into a gently inclined slope, rent into innumerable
clefts, in the hollows of which as many brooks are actively employed
in converting the angular outlines of the little islands into these
rounded hillocks. The third river behind Maguiring is larger than
those preceding it; on the sixth lies the large Visita of Borobod;
and on the tenth, that of Ragay. The rice fields cease with the h