extend to the heads of the South Alligator River.
From this hill we had a magnificent view of the country before us: it was
enclosed on all sides by high mountain ranges, of which one in particular
overtopped the rest. Porphyry was observed on several spots; indurated
clay frequently; and, on the top of the hill below which we encamped, I
found quartz porphyry, and at the foot a psammite? which I had met
several times associated with talc-schiste.

April 21.--We continued our journey in a S. 50 degrees W. course to
latitude 19 degrees 13 minutes. The country became still more
mountainous; we passed, notwithstanding, many large well grassed flats,
on which the timber grew to a greater size than we had observed it at the
lower part of the river. The poplar-gum was very frequent in the hollow,
and low stiff flats extended parallel to the river. The prevailing rock
was talc-schiste, alternating with layers of psammite. On the hills and
in the creeks, I frequently observed conglomerate, with many pieces of
quartz.

The drooping Hakea of Kent's Lagoon (Hakea lorea, R. Br.; Grevillea
lorea, R. Br. Prodr. Nov. Holl. I. p. 380) was in blossom; and on the
rocky slopes I found a new species of Hakea, having linear lanceolate
leaves with axillary fascicules of small brownish flowers: it was an
arborescent shrub, from three to six feet high; and is nearly allied to
H. arborescens (R. Br. Prodr. p. 386).

A high imposing range was visible to the northward.

April 22.--We travelled about nine miles west, making our latitude 19
degrees 12 minutes. Ranges ran parallel to the river at different
distances: we left a very fine one to the south-west and south, from
which the large creek we passed about two miles from our last camp,
probably descends. Three miles farther, a river as large or even larger
than the Burdekin, joins the latter from the westward and south-west--
the Burdekin coming down from the north-west. I was doubtful which of the
two rivers I ought to follow; but finding, after a close examination,
that the north-west branch was running, whilst the south-west one
contained only large, long, but unconnected reaches of water, I
determined upon following the north-west branch. I called the south-west
branch the "Clarke," in compliment to the Rev. W. B. Clarke of Paramatta,
who has been, and is still, most arduously labouring to elucidate the
meteorology and the geology of this part of the world. About three miles
above the j