GEOLOGY AND VEGETATION. 
XXXUl 
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 Mac- 
quarie, 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 an 
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 in- 
terwoven 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 N ew- 
Year’s Creek, a part of which it thickly lined. 
