casuarinae ceased at a particular point. On the Macquarie particularly,
these trees which had often excited our admiration from Wellington Valley
downwards, ceased to occupy its banks below the cataract, nor were they
again noticed until we arrived on the banks of the Castlereagh. The
blue-gum trees, again, were never observed to extend beyond the secondary
embankments of the rivers, occupying that ground alone which was subject
to flood and covered with reeds. These trees waved over the marshes of the
Macquarie, but were not observed to the westward of them for many miles;
yet they re-appeared upon the banks of New-Year's Creek as suddenly as
they had disappeared after we left the marshes, and grew along the line
of the Darling to unusual size. But it is remarkable, that, even in the
midst of the marshes, the blue-gum trees were strictly confined to the
immediate flooded spaces on which the reeds prevailed, or to the very beds
of the water-courses. Where the ground was elevated, or out of the reach
of flood, the box (unnamed) alone occupied it; and, though the branches of
these trees might be interwoven together, the one never left its wet and
reedy bed, the other never descended from its more elevated position. The
same singular distinction marked the acacia pendula, when it ceased to
cover the interior plains of light earth, and was succeeded by another
shrub of the same species. It continued to the banks of New-Year's Creek,
a part of which it thickly lined. To the westward of the creek, another
species of acacia was remarked for the first time. Both shrubs, like the
blue-gum and the box, mixed their branches together, but the creek formed
the line of separation between them. The acacia pendula was not afterwards
seen, but that which had taken its place, as it were, was found to cover
large tracts of country and to form extensive brushes. Many other
peculiarities in the vegetation of the interior are noticed in the body
of this work, but I have thought that these more striking ones deserved
to be particularly remarked upon.