May 10.--This morning they came again, and, when our bullocks were loaded and we were about to start, I went down to them and took a sort of leave. We had scarcely proceeded half a mile, when we missed the tinkling of our bell, and found that Charley had forgotten to put it on the horse's neck, and had left it behind. Mr. Calvert and Brown, therefore, returned to look for it, and, upon reaching the place where the camp had been made, saw the natives examining and beating every part of it; at the approach of the horsemen, however, they retired to the other side of the river; but when they turned their horses' heads, after having found the bell, the natives followed them, and threw three spears after them--whether it was out of mere wantonness, or with hostile intentions, I do not know, though I was inclined to believe the first. It was, nevertheless, a warning to us not to repose too much confidence in them. Mr. Roper met to-day with a severe accident, which nearly cost him his life. It was a very common practice to make our horses stop by catching them by the tails; as he tried to do this with his horse, which was not yet accustomed to him, the animal struck out at him, and kicked him with both feet on the chest. Roper happily recovered after some faintness, but complained for several days afterwards of external pain. We travelled this day about four miles and a half N.N.E. along the river side, following a well-beaten path of the natives.
The river was again confined in its own valley, with quartzose rocks (Psammite) on one side, and the falls of the basaltic table land on the other. Basalt was, however, observed here about on several spots at the left bank, and quartz porphyry composed the ridges near our last encampment. The river divided here into a great number of anabranches, but all confined in the same valley, and united by intermediate channels. The bed of it had again become sandy, with small pebbles of pegmatite and quartz. Casuarinas were plentiful on its banks; the poplar-gum, and the Moreton Bay ash on the adjacent flats; Tristania, with pubescent leaves round some lagoons; narrow-leaved Ironbark, and poplar-gum grew on the hills; and rich grass every where.
The night was clear, but the morning foggy, and the dew very heavy. The wind was from the northward, and, as usual, very strong after sunset.
May 11.--We travelled four miles to the E.N.E. The anabranches of the river continued; the ranges of quartz porphyry approached several times close to the river. Oak trees and drooping Melaleucas grew abundantly in its bed, and along the banks. Higher up we crossed fine flats with lagoons and lakes covered as usual with Nymphaeas. We encamped in latitude 18 degrees 32 minutes 37 seconds, after passing a Casuarina creek, with high banks and a sandy bed. This creek separated the table land from a broken low range of hills, composed of a coarse-grained sandstone. The banks of the river here seemed to have been swept away; a broad sheet of sand, covered with fine drooping tea trees, was slightly furrowed by a narrow stream of water, which seemed for the greater part filtering through the sands; chains of water-holes at its left side, fringed with Casuarinas, appeared to be anabranches of the river, and to be connected with the main stream during the rainy season.
I have to mention that a species of Sciadophyllum, nearly allied to Sc. lucidum, (Don. iii. p. 390,) was found in the lava scrub of the valley of lagoons: it was a small tree with large digitate leaves, each of them composed of from eleven to thirteen oblong acuminate, glabrous leaflets, which were about five inches long; and it attracted the attention of my companions as much by its ornamental foliage as its numerous terminal racemes of bright scarlet coloured flowers.
After having celebrated Whit-Sunday with a double allowance of fat cake and sweetened tea, I started with Charley to reconnoitre the country to the westward. Our friendly stream not only turned to the north, but afterwards to north-east and east-north-east; and though I had not succeeded in leaving it from Reedy Brook--not having been able to cross the lava streams of the basaltic table land--I now concluded, from the nature of the pebbles, and sands of the creek which we had crossed last, that the basalts and lavas had ceased, and that a passage to the westward would be practicable.
I followed the Casuarina Creek up to its head, and called it "Big Ant-hill Creek," in consequence of numerous gigantic strangely buttressed structures of the white ant, which I had never seen of such a form, and of so large a size.
The general course of the creek was north-north-west: for the first ten miles it was without water, but its middle and upper course was well provided with fine reedy holes, the constant supply of water in which was indicated by Nymphaeas, and other aquatic plants. At its left side near the junction I observed, as before mentioned, a coarse grained sandstone, and, at less than a mile higher up, I found flint rock; and, wherever I examined afterwards, the rocks proved to be coarse grained granite and pegmatite, the decomposition of which formed a sandy soil on the slopes, and clayey flats along the creek. The latter, however, were very limited. The ant-hills were intimately connected with the rock, as the ants derived their materials for building from the minute particles of clay among the sand. The primitive rock was cut with deep gullies and ravines, and several tributary creeks joined Big Ant-hill Creek from the primitive side. The basaltic table land, which extended all along the right side of the creek, formed steep slopes into its valley, and were generally topped with loose basaltic boulders. The table land was highest near the creek, and its drainage was not towards the creek, but to the south-west, into the valley of lagoons. White quartz rock was observed in a few places on the right side of the creek, where the primitive rock seemed to encroach into the territory of the basalt; and felspathic porphyry formed probably a dyke in the pegmatite, but was most evidently broken by the basalt. Where the upper part of the creek formed a shallow watercourse, and turned altogether into the primitive formation, a plain came down from the west-north-west with a shallow watercourse, which continued the separation of the two formations; the right side of the plain being basaltic, the soil of the Box and Ironbark forest loamy, with sharp pieces of the rock; the left side being sandy, and covered with a very pleasing poplar gum forest, in which the grotesque ant-hills were exceedingly numerous. About two miles higher up the plain, separated into several distinct plains, the largest of which was from twelve to fifteen miles long, and from two to three miles broad, and came from Mount Lang; another plain came from an isolated razorback hill, and a third continued on the line of contact of the basaltic and primitive rocks. The upper parts of the small creeks, which come down in these plains, were full of water, and had their source generally between heaps of bare basaltic rocks, surrounded by rich grass, and a scanty scrub of Pittosporum, of the native mulberry, of the fig-tree, and of several vines, with Polypodiums, Osmundas, and Caladiums growing between them.
Several other hills and mountains rose on the table land, generally with open plains at their base. The greater part, however, was open forest, principally of narrow-leaved Ironbark and Box, and occasionally poplar-gum.
One locality was particularly striking: a great number of rocky basins within the basalt, and surrounded by its black blocks, formed evidently so many lagoons during the wet season, as sedges and Polygonums--always inhabitants of constantly moist places--grew abundantly in most of them. These basins were situated between low basaltic rises, along which narrow flats frequently extended. The flooded gum-trees were fine and numerous, and made me frequently believe that I was approaching a creek. I rode, however, over eighteen miles of country to the westward without observing the slightest watercourse. Long flats bounded by slight undulations extended some to the northward, and others to the westward; but their inclination was imperceptible. I passed some hills and plains; and ascending one of the hills, I obtained a fine view. To the west by south I saw other isolated mountains: the country to the westward was not broken by any elevation; a fine long range was visible to the north-west.