My geological observations lead me to the conclusion, that an immense valley between granitic ranges has here been filled by a more modern basaltic eruption, which (supposing that Mount Lang is basaltic in the centre of elevation) rose in peaks and isolated hills, but formed in general a level table land. The basalt has been again broken by still more recent fissures, through which streams of lava have risen and expanded over the neighbouring rock.
May 20.--We moved our camp about eighteen miles N.N.W., to Separation Creek, the latitude of which was 18 degrees 2 minutes 22 seconds.
John Murphy found Grevillea chrysodendron in blossom, the rich orange colour of which excited general admiration. The stringy-bark tree, and Tristania, were growing on the sandy soil, and the latter near watercourses. Several native bustards (Otis Novae Hollandiae, GOULD.) were shot, and I found their stomachs full of the seeds of Grewia, which abounded in the open patches of forest ground. In crossing a plain we observed, under the shade of a patch of narrow-leaved tea trees, four bowers of the bowerbird, close together, as if one habitation was not sufficient for the wanton bird to sport in; and on the dry swamps I mentioned above, small companies of native companions were walking around us at some distance, but rose with their sonorous cu-r-r-r-ring cry, whenever Brown tried to approach them. [The natives of Argyle call the cry of the native companion, Ku-ru-duc Ku-ru-duc; the natives of Port Essington call the bird Ororr.--NOTE BY CAPT. KING]
May 21.--I went with Brown to reconnoitre the course of the creek, and to ascertain whether it flowed to the westward. We soon found, however, that it turned to the north and north-east, and that it was still an eastern water. As far as I followed it down, it formed the separation between the primitive rocks and the basalt, but received several creeks from the westward. In riding along we heard the cooees of natives, and passed several large camping places near the large water-holes of the creek. A Blackfellow emerged suddenly from the creek, holding a Casuarina branch in his hand, and pointing to the westward. We made a sign that we were going down the creek, and that we had no intention of hurting him; the poor fellow, however, was so frightened that he groaned and crouched down in the grass. Wishing not to increase his alarm, we rode on. I followed up one of the largest tributary creeks coming from the westward towards its head; it was lined with Casuarinas and flooded-gum trees, like Separation Creek, and came from an entirely granitic country, ridges and ranges, with some high hills, bounding its valley on both sides; it soon divided, however, into branches, and as one turned too much to the north and the other to the south, I kept between them to the westward, and passed over a hilly, broken, granitic country. Large blocks of granite crested the summits of the hills, and their slopes were covered with Acacia thickets, and arborescent Hakeas and Grevilleas. A dwarf Acacia, with rhomboid downy phyllodia, an inch long, grew between the rocks. The natives were busy on the hills, cutting out opossums and honey. We heard their calls and the cries of their children. As we descended into another valley, the whole slope was on fire; we passed through it, however, with little difficulty. We crossed ridges after ridges, passed from one little creek and watercourse to another, all of which turned to the northward. At last, heartily tired, and almost despairing of attaining the object of our search, viz., a western water, we came into a valley which went down to the south-west; and, following it down, found that it joined a larger one which went to the westward. A broad creek, with the drooping tea tree and a sandy bed, gave us the promise of soon finding water; and, following the tracks of numerous kangaroos and native dogs, we came to a small pool. After passing over very rocky granitic hills, we came into a more open country; the banks of the creek became reedy, and water was more abundant, and at last a fine pool, surrounded by a rich belt of reeds, was before us. Brown was fortunate enough to shoot two ducks; and, as the sun was setting behind a neighbouring hill, we made our camp for the night.
May 22.--We returned to our companions, and by taking a W.N.W. course, we avoided all the ranges and gullies that we had crossed yesterday. At the westerly creek I found a rose-coloured Sterculia, with large campanulate blossoms and tomentose seed-vessels: the tree had lost all its foliage. I had met with this species on the rocky ranges of Moreton Bay (at Mount Brisbane), but there it was a low shrub, whereas in this place, and all round the gulf of Carpentaria, it formed a middle sized tree with spreading branches. A new Hakea, with long thin terete leaves (different from H. lorea) and Grevillea chrysodendron, grew along the creek. Grevillea ceratophylla (R. Br.) and another Grevillea, with a compound terminal thyrsus, and long lanceolate falcate leaves, grew on the slopes, in company with a Xylomelum, with smooth and smaller seed-vessels than those of X. pyriforme. The rocky ridges were occupied by the stringy-bark, fine Cypress-pine trees, the stunted silver-leaved Ironbark, a Eucalyptus, with very scanty foliage, orange-coloured blossoms, seed-vessels longitudinally ribbed, and as large as the egg of a fowl; its butt was covered with a lamellar bark, but the upper part and the branches were white and smooth; also by another Eucalyptus, with a scaly butt like the Moreton Bay ash, but with smooth upper trunk and cordate ovate leaves, which was also new to me; we called it the Apple-gum. We frequently met with the grass tree (Xanthorrhaea.)
May 23.--We moved our camp to the westerly creek I had found the day before, which with several others formed the heads of a river, flowing to the N.W. I called this river the "Lynd," after R. Lynd, Esq., a gentleman to whom I am under the greatest obligation, for his unmeasured liberality and kindness enabled me to devote my time exclusively to the pursuits of science and exploration.
The nights had been as usual very cold, and the dew very heavy. The prevailing breeze was from the east, veering towards evening to the north-east; during the morning a cold south-east wind. The rock was primitive, granite and pegmatite in several varities, with a few exceptions of anagenitic formation. Near the place of our first encampment on the Lynd, in lat. 17 degrees 58 minutes, I observed a sienite, to which the distribution of the hornblende in layers had given the stratified appearance of gneiss. Another rock was composed of felspar and large leaflets of white mica, or of quartz and white mica. The veins which traversed these rocks were all of quartz, which, within the pegmatite, enlarged into big masses and hills, particularly where basaltic rock was near. Mr. Gilbert and Charley went down the creek to find water and a practicable road, in case the country should prove mountainous and rocky. I had a view from a small peak near our camp; the country was full of ridges, but openly timbered, and I saw a low range to the northward, trending from east to west.
May 24.--It was the Queen's birth-day, and we celebrated it with what--as our only remaining luxury--we were accustomed to call a fat cake, made of four pounds of flour and some suet, which we had saved for the express purpose, and with a pot of sugared tea. We had for several months been without sugar, with the exception of about ten pounds, which was reserved for cases of illness and for festivals. So necessary does it appear to human nature to interrupt the monotony of life by marked days, on which we indulge in recollections of the past, or in meditations on the future, that we all enjoyed those days as much, and even more, than when surrounded with all the blessings of civilized society; although I am free to admit, that fat-cake and sugared tea in prospectu might induce us to watch with more eagerness for the approach of these days of feasting. There were, besides, several other facts interesting to the psychologist, which exhibited the influence of our solitary life, and the unity of our purpose, on our minds. During the early part of our journey, I had been carried back in my dreams to scenes of recent date, and into the society of men with whom I had lived shortly before starting on my expedition. As I proceeded on my journey, events of earlier date returned into my mind, with all the fantastic associations of a dream; and scenes of England, France, and Italy passed successively. Then came the recollections of my University life, of my parents and the members of my family; and, at last, the days of boyhood and of school--at one time as a boy afraid of the look of the master, and now with the independent feelings of the man, communicating to, and discussing with him the progress of my journey, the courses of the rivers I had found, and the possible advantages of my discoveries. At the latter part of the journey, I had, as it were, retraced the whole course of my life, and I was now, in my dreams, almost invariably in Sydney, canvassing for support, and imagining that, although I had left my camp, yet that I should return with new resources to carry us through the remainder of our journey. It was very remarkable, that all my companions were almost invariably anticipating the end of our journey, dreaming that they reached the sea-coast, and met with ships, or that they were in Port Essington and enjoying the pleasures of civilized life; whilst I, on awaking, found my party and my interests on the place where I had left them in my dreams. During the leisure moments of the day, or at the commencement of night, when seated at my fire, all my thoughts seemed riveted to the progress and success of my journey, and to the new objects we had met with during the day. I had then to compel myself to think of absent friends and past times, and the thought that they supposed me dead or unsuccessful in my enterprize, brought me back immediately to my favourite object. Much, indeed the greater portion, of my journey had been occupied in long reconnoitring rides; and he who is thus occupied is in a continued state of excitement, now buoyant with hope, as he urges on his horse towards some distant range or blue mountain, or as he follows the favourable bend of a river; now all despairing and miserable, as he approaches the foot of the range without finding water from which he could start again with renewed strength, or as the river turns in an unfavourable direction, and slips out of his course. Evening approaches; the sun has sunk below the horizon for some time, but still he strains his eye through the gloom for the dark verdure of a creek, or strives to follow the arrow-like flight of a pigeon, the flapping of whose wings has filled him with a sudden hope, from which he relapses again into a still greater sadness; with a sickened heart he drops his head to a broken and interrupted rest, whilst his horse is standing hobbled at his side, unwilling from excessive thirst to feed on the dry grass. How often have I found myself in these different states of the brightest hope and the deepest misery, riding along, thirsty, almost lifeless and ready to drop from my saddle with fatigue; the poor horse tired like his rider, footsore, stumbling over every stone, running heedlessly against the trees, and wounding my knees! But suddenly, the note of Grallina Australis, the call of cockatoos, or the croaking of frogs, is heard, and hopes are bright again; water is certainly at hand; the spur is applied to the flank of the tired beast, which already partakes in his rider's anticipations, and quickens his pace--and a lagoon, a creek, or a river, is before him. The horse is soon unsaddled, hobbled, and well washed; a fire is made, the teapot is put to the fire, the meat is dressed, the enjoyment of the poor reconnoiterer is perfect, and a prayer of thankfulness to the Almighty God who protects the wanderer on his journey, bursts from his grateful lips.
May 25.--We travelled about eight miles down the Lynd. The country was very mountainous; granitic and pegmatite ranges bounded the valley on both sides.
May 26.--We continued our journey over the most mountainous and rocky country we had ever passed. The ranges formed the banks of the river itself, and even entered its bed, which gradually enlarged and was frequently formed by several channels fringed with large drooping tea trees. At the end of the stage, basalt was found to have broken through the granite.