Insignificant As This Stream Is, The Jesuit Falconer, Whose
Information Is Generally So Very Correct, Figures It As A
Considerable River, Rising At The Foot Of The Cordillera.
With
respect to its source, I do not doubt that this is the case
for the Gauchos assured me, that in the middle of the dry
summer, this stream, at the same time with the Colorado
has periodical floods; which can only originate in the snow
melting on the Andes.
It is extremely improbable that a
stream so small as the Sauce then was, should traverse the
entire width of the continent; and indeed, if it were the
residue of a large river, its waters, as in other ascertained
cases, would be saline. During the winter we must look to
the springs round the Sierra Ventana as the source of its
pure and limpid stream. I suspect the plains of Patagonia
like those of Australia, are traversed by many water-courses
which only perform their proper parts at certain periods.
Probably this is the case with the water which flows into the
head of Port Desire, and likewise with the Rio Chupat, on
the banks of which masses of highly cellular scoriae were
found by the officers employed in the survey.
As it was early in the afternoon when we arrived, we
took fresh horses, and a soldier for a guide, and started for
the Sierra de la Ventana. This mountain is visible from
the anchorage at Bahia Blanca; and Capt. Fitz Roy calculates
its height to be 3340 feet - an altitude very remarkable
on this eastern side of the continent.
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