The night of the 8th February was cloudy, with a little rain, which continued to the morning of the 9th, but cleared up at noon, and the weather became very hot. During the afternoon, thunder-storms passed to the north and north-west, and also to the east and east-south-east. On the 10th, thunder-storms again surrounded us on all sides, and from one, which broke over us in the night, a heavy shower fell. The night of the 11th was exceedingly cold; and the night breeze was observed to be less regular than formerly.

We were here very much troubled with a small black ant; infesting our provisions during the day and running over our persons, and biting us severely at night. A large yellow hornet with two black bands over the abdomen, was seen, humming about the water-holes. A crow was shot and roasted, and found to be exceedingly tender, which we considered to be a great discovery; and lost no opportunity of shooting as many as we could, in order to lessen the consumption of our dried meat. We again enjoyed some fine messes of Portulaca.

Feb. 12.--I went, accompanied by Mr. Roper and Charley, in a due north direction to reconnoitre the country. The flat continued for about eight miles, and then changed into slight undulations. Considerable tracts were covered with the Poplar-gum; and broad belts of Bricklow descended from the hills towards the east. In the scrub; Fusanus was observed in fruit, and the Stenochilus and the white Vitex in blossom; from the latter the native bee extracts a most delicious honey. A small tree, with stiff alternate leaves scarcely an inch long, was covered with red fruit of the form of an acorn, and about half an inch long, having a sweet pericarp with two compressed grain-like seeds, which had the horny albumen of the coffee, and were exceedingly bitter. The pigeons, crows, and cockatoos, fed upon them, we also ate a great number of them; but the edible portion of each seed was very small. It is a remarkable fact that trees, which we had found in full blossom or in fruit in October and November, were again observed to be in blossom and fruit in February.

We had to encamp at night without water; and although the clouds gathered in the afternoon of a very hot day, yet no thunder-storm came to our relief. The night breeze, which was in all probability the sea-breeze, set in about ten minutes to six.

Feb. 13.--The morning was very cloudy. I continued my course to the northward, and, coming to a watercourse, followed it down in the hopes of finding water: it led us to the broad deep channel of a river, but now entirely dry. The bed was very sandy, with reeds and an abundance of small Casuarinas. Large flooded-gums and Casuarinas grew at intervals along its banks, and fine openly timbered flats extended on both sides towards belts of scrub. The river came from the north and north-west, skirting some fine ranges, which were about three miles from its left bank. As the river promised to be one of some importance I called it the "Isaacs," in acknowledgment of the kind support we received from F. Isaacs, Esq. of Darling Downs.

When we were approaching the river, the well-known sound of a tomahawk was heard, and, guided by the noise, we soon came in sight of three black women, two of whom were busily occupied in digging for roots, whilst the other, perched on the top of a high flooded-gum tree, was chopping out either an opossum or a bees' nest. They no sooner perceived us than they began to scream most dreadfully, swinging their sticks, and beating the trees, as if we were wild beasts, which they wished to frighten away. We made every possible sign of peace, but in vain: the two root-diggers immediately ran off, and the lady in the tree refused to descend. When I asked for water, in the language of the natives of the country we had left--"Yarrai" "yarrai," she pointed down the river, and answered "yarrai ya;" and we found afterwards that her information was correct. Upon reaching the tree we found an infant swaddled in layers of tea-tree bark, lying on the ground; and three or four large yams. A great number of natives, men, boys, and children, who had been attracted by the screams of their companions, now came running towards us; but on our putting our horses into a sharp canter, and riding towards them, they retired into the scrub. The yams proved to be the tubers of a vine with blue berries; both tubers and berries had the same pungent taste, but the former contained a watery juice, which was most welcome to our parched mouths. A similar tuber was found near Mount Stewart on the 18th January. We then proceeded down the river; but not succeeding in our search for water, returned to our camp, which was about fifteen miles distant. As soon as I arrived, I sent Mr. Gilbert and Brown down Hughs's Creek, to examine the country near its junction.

Very thick clouds came from the westward, from which a few drops of rain fell: thunder-storms were forming to the north-east and also to the west, but none reached us: the night was very cloudy and warm: the scud flying from the north-east.

Feb. 14.--After sunrise the weather cleared up again. All hands were now employed in shooting crows; which, with some cockatoos, and a small scrub wallabi, gave us several good messes.

Mr. Gilbert and Brown had, on their excursion, found a rushy lagoon on the left bank of the Isaacs, at a short half-mile from its junction with Hughs's Creek. Here they encamped; and, about 10 o'clock at night, the loud voices of Blackfellows travelling down the river were heard; these also encamped at some small water-holes, not very distant from Mr. Gilbert, of whose presence they were not aware. Mr. Gilbert kept the horses tied up in case of any hostility; but was not molested. The blacks continued their loud conversations during the greater part of the night; and Mr. Gilbert departed very early in the morning without being seen by them. He continued to follow the river further down, and found that four large creeks joined it from the northward. Another creek also joined it from the southward; as subsequently observed by Mr. Roper. Beyond these creeks, several lagoons or swamps were seen covered with ducks, and several other aquatic birds, and, amongst them, the straw-coloured Ibis.

Feb. 15.--We travelled down to the above-mentioned lagoon, which was about ten miles east by north from our camp; its latitude, was by calculation, about 22 degrees 20 or 21; for several circumstances had prevented me from taking observations. As the river turned to the eastward, I determined to trace it up to its head; and set out with Mr. Gilbert and Brown to examine the country around the range which I had observed some days before and named "Coxen's Peak and Range," in honour of Mr. Coxen of Darling Downs. We passed the night at a small pool, but were not successful in discovering water in any of the numerous watercourses and creeks, which come down from Coxen's Range, or out of the belt of scrub which intervened between the range and the river. A loose variegated clayey sandstone, with many irregular holes; cropped out in the beds of the creek. Coxen's Peak and Range were found to be composed of horizontal strata of excellent sandstone, rising by steep terraces, on the western side, but sloping gently down to the east; its summit is covered with scrub, but its eastern slope with groves of grass-trees. The view from the top of Coxen's Peak was very extensive: towards the south-west and west, Peak Range was seen extending from Scott's and Roper's Peaks to Fletcher's Awl; and, beyond the last, other mountains were seen, several of which had flat tops. Mount Phillips seemed about thirty or forty miles distant; and a very indistinct blue hill was seen to the W.N.W. To the northward, ranges rose beyond ranges, and to the eastward, the country seemed to be flat, to a great extent, and bounded by distant mountains. To the southward, the eye wandered over an unbroken line of horizon, with the exception of one blue distant elevation: this immense flat was one uninterrupted mass of forest without the slightest break. Narrow bands of scrub approached the river from the westward, and separated tracts of fine open forest country, amongst which patches of the Poplar-gum forest were readily distinguished by the brightness of their verdure. A river seemed to come from the south-west; the Isaacs came from the north-west, and was joined by a large creek from the northward. There was no smoke, no sign of water, no sign of the neighbourhood of the sea coast;--but all was one immense sea of forest and scrub.