white-barked gum trees appeared; but, although they had the character of
river trees, we found they grew on an elevated piece of clay soil. After
completing about ten miles, I halted for two hours to rest the horses,
where there was a patch of good grass, and we gave them some water from
our stock. The mercurial column afforded no indication that we were at
all higher than our camp overlooking the river, and it seemed, therefore,
not improbable that we might meet with some other channel or branch of
that prolific river. After resting two hours we continued, passing
through woods partly of open forest trees, and partly composed of scrub.
Towards the end of our day's journey, we crossed land covered with good
grass, and having only large trees on it, so thinly strewed as to be of
the character of the most open kind of forest land. Saw thereon some very
large kangaroos, and throughout the day we had found their tracks
numerous. We finally set up our bivouac a little before sunset, on a
grassy spot surrounded by scrub. In this scrub I found the CLEOME FLAVA
of Banks, and the strong-smelling AMBRINA CARINATA. A very remarkable
whiteness appeared on the leaves of the EUCALYPTUS POPULIFOLIUS, which,
on very close examination, appeared to be the work of an insect.[*] On
the plains the SALSOLA AUSTRALIS formed a round bush, which, when loose
from its very slight root, was liable to be blown about. Thermometer at
sunrise, 71°; at 9 P. M, 68°;--with wet bulb, 64°.

[* The following letter from Mr. Westwood to Dr. Lindley relates to
specimens of this brought to England:--

"I am sorry that the state of the specimens from Sir Thomas Mitchell (or
rather, I should say, the time when they were gathered) does not allow me
to say much about the insect by which they are formed. It is an extremely
beautiful production, quite unlike any thing I have yet seen, and is, I
have no doubt, the scale of a coccus. It is of a very peculiar form,