In these two
creeks, as he called them, on account of the absence of flowing water in
their beds, Sturt unwittingly crossed the second and only other great
inland river system of the continent. In the basin he traversed, in which
these creeks lost their character, he was riding over the united beds of
the Barcoo, the Thomson, the Diamentina, and the Herbert, west of whose
waters nothing in the shape of a defined system of drainage exists, until
the rivers of the western coast are reached. As a scientific explorer
then, whose object was to unravel the mystery of the interior, solve, if
possible, the question of its strange peculiarity, and trace out its
physical formation, Sturt may well be held the first and greatest. His
success, perhaps, was greater than he himself imagined, he came back
dispirited with failure but as before he had found the broad outlines of
the plan of the drainage of the great plains, to be afterwards completed
by the discoveries of the tributary streams.
In addition to his longing to be the first to reach the centre of
Australia, Sturt fondly hoped that once past the southern zone of the
tropics, he would find himself in a country blessed with a heavier and
more constant rainfall; as it was impossible for him to know at that
time, that the force of the north-west monsoon was expended on the
northern coast, and none of the tropical deluge found its way with any
degree of regularity to the thirsty inland slope; this theory appeared
on the face of it, feasible.
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