considerable depth, was first discovered by the circumstance
of fish having been observed in the neighbourhood.

FERNANDO NORONHA, Feb. 20th. -- As far as I was enabled
to observe, during the few hours we stayed at this place, the
constitution of the island is volcanic, but probably not of a
recent date. The most remarkable feature is a conical hill,
about one thousand feet high, the upper part of which is
exceedingly steep, and on one side overhangs its base. The
rock is phonolite, and is divided into irregular columns. On
viewing one of these isolated masses, at first one is inclined
to believe that it has been suddenly pushed up in a semi-fluid
state. At St. Helena, however, I ascertained that some
pinnacles, of a nearly similar figure and constitution, had
been formed by the injection of melted rock into yielding
strata, which thus had formed the moulds for these gigantic
obelisks. The whole island is covered with wood; but from
the dryness of the climate there is no appearance of luxuriance.
Half-way up the mountain, some great masses of the
columnar rock, shaded by laurel-like trees, and ornamented
by others covered with fine pink flowers but without a single
leaf, gave a pleasing effect to the nearer parts of the scenery.

BAHIA, OR SAN SALVADOR. BRAZIL, Feb. 29th. -- The day
has passed delightfully. Delight itself, however, is a weak
term to express the feelings of a naturalist who, for the first
time, has wandered by himself in a Brazilian forest. The
elegance of the grasses, the novelty of the parasitical plants,
the beauty of the flowers, the glossy green of the foliage,
but above all the general luxuriance of the vegetation, filled