[* A. HETEROPHYLLA (Hooker MSS.) foliis ovato-acuminatis grosse sinuatoserratis integris cordatisve trifidis, utrinque bracteisque glaberrimis.]
12TH APRIL.—I accordingly put the party in motion at an early hour, and soon came upon the river, where it formed a noble reach of water and came from the westward, a new direction, which, with the sand that had for some days appeared in shallow parts of its bed, raised my hopes that this river might be found to come from the north-west, a direction it maintained for five miles. The breadth was uniform, and the vast body of water was a most cheering sight. The banks were 120 yards apart, the course in general very straight, contributing much to the perspective of the scenery upon it. At one turn, denuded rocks appeared in its bed, consisting of ironstone in a whitish cement or matrix, which might have been decomposed felspar. I at length arrived at a natural bridge of the same sort of rock, affording easy and permanent access to the opposite bank, and at once selected the spot for a dépôt camp, which we established on a fine position commanding long vistas both up and down the river. It was, in fact, a tête-de-pont overlooking the rocky passage which connected the grass on both sides. This was No. VIII., and in latitude 28° 1' 37''. Thermometer, at sunrise, 68°; at noon, 104°; at 4 P. M., 101°; at 9, 74°;—with wet bulb, 64°.
13TH APRIL.—Here I could leave the jaded cattle to refresh, while, with a small party on horse-back, I could ascertain the farther course of the river, and explore the country to the north-west where centred all my hopes of discovery. I set on foot various preparations, such as the stuffing of saddles, shoeing of horses, drying of mutton, and, first of all in importance, though last likely to be accomplished, the making a pair of new wheels for a cart to carry water. Thermometer, at sunrise, 47°; at noon, 100°; at 4 p.m., 101°; at 9, 67°;—with wet bulb, 62°.
15TH APRIL.—This day I sent Mr. Kennedy to examine the country in the direction of 331½°, my intended route, and he returned about 10 P. M., having seen what he considered indications of the river on his right when about twelve miles from the camp, and plains to the left. Upon the whole, I resolved, from what he said of the scrubs he had met with, to travel north-west, that direction being perpendicular to the general course of this river, and therefore the most likely to lead the soonest to higher ground. Thermometer, at sunrise, 68°; at noon, 104°; at 4 p.m., 103°; at 9, 72°;—with wet bulb, 67°.
16TH APRIL.—In order better to contend with the difficulty of wanting water, and be better prepared for it, I formed my party rather of infantry than cavalry, taking only two horses, drawing a cart loaded chiefly with water, and six trusty men, almost all old soldiers. We were thus prepared to pass several nights without requiring other water than that we carried with us. I hoped thus to be enabled to penetrate the scrubs, and reach, and perhaps cross, the higher land bounding this great basin. Our first day's progress, being rather experimental, did not extend above ten miles. I had been obliged to send back the shaft horse, and exchange him for a better, as our load of water was heavy. The day was very sultry. Thermometer 105° Fahrenheit, in the shade. We had passed over ground more open than I expected, but by no means clear of scrubs. Thermometer, at sunrise, 64°; at 4 p.m., 105°; at 9, 71°;—with wet bulb, 67°.
17TH APRIL.—The messenger returned early with two horses, one being my own second charger, which I put as leader to the cart. We then got forward on foot as fast as the men could walk, or rather as fast as they could clear a way for the cart. We passed through much scrub, but none was of the very worst sort. The natives' marks on trees were numerous, and the ground seemed at first to fall westward as to some water-course; and, after travelling about five miles, there appeared a similar indication of water to the eastward of our route. At one place even the 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, resembling a very delicate, broad, and flattened valve of a bi-valve shell, such as the genus Iridina, the part where the hinge is being a little produced and raised, and forming the cover of the coccus which secretes the beautiful material just in the same unexplained way as the scale insects form the slender attenuated scales beneath which they are born. I could not discover any insect beneath the specimens of Sir Thomas Mitchell's production in a state sufficient to determine what it really is, as I only found one or two exceedingly minute atoms of shrivelled up insects. It is extremely brittle, and looks more like dried, white, frothed sugar than any thing else.">[
18TH APRIL.—A pigeon had flown last evening over our camp in a N. N. E. direction, and as the ground sloped that way, and the men believed that water was there, I rode this morning in that direction, leaving the other horses to feed in the meantime. At two miles from our bivouac I found some hollows in a scrub where the surface consisted of clay, and which evidently at some seasons contained water, although they were then dry. Polygonum grew around them, and I doubt not that after a fall of rain water would remain there some time. On riding two miles beyond, in the same direction, I found open forest land only. The country was well covered with good grass, very open, yet finely wooded. We again proceeded north-west over some fine forest land. The soil was, however, only soft red sand, and made it very heavy work for our horses drawing the watercart.
On passing through a Casuarina scrub, we entered upon a different kind of country as to wood and grass, the soil being much the same, or still more loose and sandy. The surface bore a sterile heathy appearance, and the trees consisted chiefly of a stunted box, growing but thinly. Instead of grass, black, half-burnt roots of a wiry plant appeared, which I afterwards found in flower (SEE INFRÀ), and one small, shrubby, brown bush, very much resembling heath; apparently a Chenopod with heathlike leaves, and globular hairy heads of flowers. The roots of the firstmentioned plant presented much obstruction to our cart-wheels in passing over the soft sand. As I stood awaiting the cart's arrival, some birds drew my attention, as I perceived I had attracted theirs. They descended to the lowest branches of the tree in whose shade I stood, and seemed to regard my horse with curiosity. On my imitating their chirp one fluttered down, and attempted to alight on my horse's ears. On my whistling to them, one whistled some beautifully varied notes, as soft as those of an octave flute, although their common chirp was harsh and dissonant. The male and female seemed to have very different plumage, especially about the head; that on the one having the varying tint of the Rifle bird, the head of the other more resembling in colour, that of the DACELO GIGANTEUS. They were about the size of a thrush, and seemed the sole residents of that particular spot, and I had not seen them elsewhere. The carts came slowly forward, the horses being much distressed. I continued to ride some miles ahead, and passed through a scrub in a clay hollow, to which succeeded another open forest country with more of the soft red sand. The people with the cart could not overtake me, and I returned. Meeting them at a rather bad place, I determined to encamp at some patches of grassy ground somewhat out of our line, in latitude, 27° 43' S. It is remarkable that, according to the barometer, we had not ascended higher than our depôt camp on the river, at a distance of nearly forty miles from it. I had just quitted my horse's back, and had resolved to return, when two horsemen were seen approaching along our track. They were two of our party come from the depôt to bring me a despatch, which had been forwarded by Commissioner Wright, communicating the news of Dr. Leichardt's return from Port Essington, and enclosing the Gazette with his own account of his journey. Thus it became known to us that we could no longer hope to be the first to reach the shores of the Indian Ocean by land. Thermometer, at sunrise, 62°; at 4 p.m., 93°; at 9, 71°;—with wet bulb, 64°.