But it supported many different kinds
of plants, and the grass, though brown and withered, was
more abundant, as the thorny bushes were less so.
These
latter in a short space entirely disappeared, and the plains
were left without a thicket to cover their nakedness. This
change in the vegetation marks the commencement of the
grand calcareo argillaceous deposit, which forms the wide
extent of the Pampas, and covers the granitic rocks of Banda
Oriental. From the Strait of Magellan to the Colorado, a
distance of about eight hundred miles, the face of the country
is everywhere composed of shingle: the pebbles are
chiefly of porphyry, and probably owe their origin to the
rocks of the Cordillera. North of the Colorado this bed
thins out, and the pebbles become exceedingly small, and
here the characteristic vegetation of Patagonia ceases.
Having ridden about twenty-five miles, we came to a
broad belt of sand-dunes, which stretches, as far as the eye
can reach, to the east and west. The sand-hillocks resting
on the clay, allow small pools of water to collect, and thus
afford in this dry country an invaluable supply of fresh
water. The great advantage arising from depressions and
elevations of the soil, is not often brought home to the mind.
The two miserable springs in the long passage between the
Rio Negro and Colorado were caused by trifling inequalities
in the plain, without them not a drop of water would have
been found. The belt of sand-dunes is about eight miles
wide; at some former period, it probably formed the margin
of a grand estuary, where the Colorado now flows. In this
district, where absolute proofs of the recent elevation of
the land occur, such speculations can hardly be neglected by
any one, although merely considering the physical geography
of the country. Having crossed the sandy tract, we arrived
in the evening at one of the post-houses; and, as the fresh
horses were grazing at a distance we determined to pass
the night there.
The house was situated at the base of a ridge between
one and two hundred feet high - a most remarkable feature
in this country. This posta was commanded by a negro
lieutenant, born in Africa: to his credit be it said, there
was not a ranche between the Colorado and Buenos Ayres in
nearly such neat order as his. He had a little room for
strangers, and a small corral for the horses, all made of
sticks and reeds; he had also dug a ditch round his house
as a defence in case of being attacked. This would, however,
have been of little avail, if the Indians had come; but
his chief comfort seemed to rest in the thought of selling
his life dearly. A short time before, a body of Indians had
travelled past in the night; if they had been aware of the
posta, our black friend and his four soldiers would assuredly
have been slaughtered. I did not anywhere meet a more
civil and obliging man than this negro; it was therefore
the more painful to see that he would not sit down and eat
with us.
In the morning we sent for the horses very early, and
started for another exhilarating gallop. We passed the
Cabeza del Buey, an old name given to the head of a large
marsh, which extends from Bahia Blanca. Here we changed
horses, and passed through some leagues of swamps and
saline marshes. Changing horses for the last time, we again
began wading through the mud. My animal fell and I was
well soused in black mire - a very disagreeable accident
when one does not possess a change of clothes. Some miles
from the fort we met a man, who told us that a great gun
had been fired, which is a signal that Indians are near. We
immediately left the road, and followed the edge of a marsh,
which when chased offers the best mode of escape. We
were glad to arrive within the walls, when we found all the
alarm was about nothing, for the Indians turned out to be
friendly ones, who wished to join General Rosas.
Bahia Blanca scarcely deserves the name of a village. A
few houses and the barracks for the troops are enclosed by
a deep ditch and fortified wall. The settlement is only of
recent standing (since 1828); and its growth has been one of
trouble. The government of Buenos Ayres unjustly occupied
it by force, instead of following the wise example of the
Spanish Viceroys, who purchased the land near the older
settlement of the Rio Negro, from the Indians. Hence the
need of the fortifications; hence the few houses and little
cultivated land without the limits of the walls; even the
cattle are not safe from the attacks of the Indians beyond
the boundaries of the plain, on which the fortress stands.
The part of the harbour where the Beagle intended to
anchor being distant twenty-five miles, I obtained from the
Commandant a guide and horses, to take me to see whether
she had arrived. Leaving the plain of green turf, which
extended along the course of a little brook, we soon entered
on a wide level waste consisting either of sand, saline
marshes, or bare mud. Some parts were clothed by low
thickets, and others with those succulent plants, which
luxuriate only where salt abounds. Bad as the country was,
ostriches, deer, agoutis, and armadilloes, were abundant. My
guide told me, that two months before he had a most narrow
escape of his life: he was out hunting with two other men,
at no great distance from this part of the country, when they
were suddenly met by a party of Indians, who giving chase,
soon overtook and killed his two friends. His own horse's
legs were also caught by the bolas, but he jumped off, and
with his knife cut them free:
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