cliffs commences, which exposes a section of the geological
nature of the country. The strata are of sandstone, and
one layer was remarkable from being composed of a firmly-
cemented conglomerate of pumice pebbles, which must have
travelled more than four hundred miles, from the Andes.
The surface is everywhere covered up by a thick bed of
gravel, which extends far and wide over the open plain.
Water is extremely scarce, and, where found, is almost
invariably brackish. The vegetation is scanty; and although
there are bushes of many kinds, all are armed with formidable
thorns, which seem to warn the stranger not to enter on
these inhospitable regions.

The settlement is situated eighteen miles up the river.
The road follows the foot of the sloping cliff, which forms
the northern boundary of the great valley, in which the Rio
Negro flows. On the way we passed the ruins of some fine
"estancias," which a few years since had been destroyed by
the Indians. They withstood several attacks. A man present
at one gave me a very lively description of what took place.
The inhabitants had sufficient notice to drive all the cattle
and horses into the "corral" [1] which surrounded the house,
and likewise to mount some small cannon. The Indians were
Araucanians from the south of Chile; several hundreds in
number, and highly disciplined. They first appeared in two
bodies on a neighbouring hill; having there dismounted, and
taken off their fur mantles, they advanced naked to the
charge. The only weapon of an Indian is a very long bamboo
or chuzo, ornamented with ostrich feathers, and pointed
by a sharp spearhead. My informer seemed to remember