I observed a fine sienite on several spots; it is of a whitish colour, and contains hornblende and mica in almost equal quantities; granite was also seen, and both rocks probably belong to each other, the presence of hornblende being local.  A very hard pudding-stone crops out about nine miles down the river.  From the ridges, hills were seen to the N.N.E. and to the westward.  Vitex scrub is met with in patches of small extent.  A white crane, and the whistling duck, were seen.  Black ducks and teal were most common, and Charley shot eight of them.  On the banks of the more or less dry water-holes grows an annual leguminous plant, which shoots up into a simple stem, often to the height of twelve feet; its neck and root are covered with a spongy tissue; its leaves are pinnate, a foot or more in length, with small leaflets; it bears mottled yellow flowers, in axillary racemes; and long rough, articulate pods, containing small, bright, olive-green seeds.  I first saw this plant at Limestone, near Moreton Bay, and afterwards at the water-holes of Comet River.  It was extremely abundant in the bed of the Burdekin, and was last seen on the west side of the gulf of Carpentaria; I could, however, easily distinguish three species of this plant. [They belong probably to the two genera, Aeschynomene and Sesbania.]

Last evening, clouds gathered in the west, but cleared off after sunset; the night again cloudy, the forenoon equally so; in the afternoon the clouds were dissipated by a north-east wind.

March 24.—­We travelled about nine miles N. 60 degrees W. along the river; a small creek joined from the westward.  At night we had a heavy thunder-storm from the S.W.

March 25.—­Weather very hot; clouds formed during the afternoon.  We continued our journey along the river to lat. 21 degrees 3 minutes; the river winds considerably.  We passed several hills at the latter part of the stage.  I ascended one of them, on the right bank of the river, and obtained an extensive view of the country, which has a very uniform character.  There were ridges and low ranges to the westward, one of which stretched from N. by W. far to the westward.  The hill on which I stood was composed of limestone rock; it was flat-topped, with steep slopes at each end.

In lat. about 21 degrees 6 minutes, we crossed a large creek, densely lined with dropping tea trees, coming from the westward.  It was here we first met with Careya arborea (Roxb.), a small tree from fifteen to twenty feet high, with elliptical leaves of soft texture, four inches long, and two in breadth; its fruit was about two inches long, contained many seeds, and resembled that of the Guava.  Its leaves, however, had neither the vernation nor the pellucid dots of Myrtaceous trees.  At the junction of the creek, a great number of small Corypha palms were growing, and my companions observed the dead stems of some very high ones, whose tops had been cut off by the natives, probably to obtain