We found here Unios of a fine pink and purple colour inside the valves, and a new species of Cyclas with longitudinal ribs. Small black ants, and little flies with wings crossing each other, annoy us very much, the one creeping all over our bodies and biting us severely, and the other falling into our soup and tea, and covering our meat; but the strong night-breeze protects us from the mosquitoes. A pretty lizard (Tiliqua) of small size, with yellowish spots on a brown ground, was caught, and seemed to be plentiful here about. The Acacia, with very long linear drooping leaves, that had been observed at the Dawson, re-appeared both on Comet Creek and the banks of the Mackenzie. Our latitude was 23 degrees 33 minutes 38 seconds.

Jan. 13.--We travelled about nine miles E.N.E. over the high land, and through open forest land, and several plains skirted on both sides by scrub. I observed a new species of Flindersia, a small tree about thirty feet high, with thin foliage and very regular branches, forming a spire. The latitude was 23 degrees 29 minutes.

Jan. 14.--After travelling about three miles in a north-easterly direction along the banks of the river--having, at about a mile from our camp, crossed a good-sized creek on its left bank--the river took a sudden bend to the westward, and a large creek coming from the northward, joined it almost at a right angle to its course. As we proceeded, we came suddenly upon two black women hurrying out of the water, but who, on reaching a distance in which they thought themselves safe, remained gazing at us as we slowly and peaceably passed by. In the bed of the river, which was here broad and sandy, a bean was gathered, bearing racemes of pink blossoms, and spreading its long slender stem over the ground, or twining it round shrubs and trees: its pods were from three to five inches long, and about half an inch broad, containing from four to six seeds, very similar to the horse-bean. This plant was afterwards found growing in the sandy beds, or along the bergs of almost all the broad rivers, and was always a welcome sight; for the seeds, after roasting and pounding them, afforded us a very agreeable substitute for coffee.

We passed some very high cliffs, which showed a fine geological section of horizontal layers of sandstone and coal-slate. There were also some layers of very good coal, but the greater part of those visible were of a slaty character. Nodules of Ironstone were very frequent in the sandstone.

After having fixed upon a place to pitch the tent, and after some refreshment, I started with my two black companions upon a reconnoitring excursion along the course of the river, which made several large bends, though its general direction was to the north-east. We passed over some very fine flats of Bastard-box, silver-leaved Ironbark, and white gum, with a few scattered Acacia-trees, remarkable for their drooping foliage, and mentioned under the date 22nd December. Farther on, we came again to scrub, which uniformly covered the edge of the high land towards the river. Here, within the scrub, on the side towards the open country we found many deserted camps of the natives, which, from their position, seemed to have been used for shelter from the weather, or as hiding-places from enemies: several places had evidently been used for corroborris, and also for fighting.

On a White-gum, which has long lanceolate green leaves, I found a species of Loranthus, with leaves resembling those of the silver-leaved Ironbark (Eucalyptus pulverulentus). Having reached a point down the river, in about lat. 23 degrees 18 minutes, from which some low ranges to the N.W. became visible, I returned to the camp. At the point where it turned, a dyke of basalt traverses the river. The country still maintained its favourable character, and the river contained fine sheets of water similar to those already described, on one of which a pelican floated undisturbed by our presence. Large heaps of muscle-shells, which have given food to successive generations of the natives, cover the steep sloping banks of the river, and indicate that this part of the country is very populous. The tracks of the natives were well beaten, and the fire-places in their camps numerous. The whole country had been on fire; smouldering logs, scattered in every direction, were often rekindled by the usual night breeze, and made us think that the Blackfellows were collecting in numbers around us,--and more particularly on the opposite side of the river; added to which, the incessant splashing of numerous large fishes greatly contributed to augment our fears. As a matter of precaution, therefore, we tied our horses near our sleeping-place, and gathered the grass which grew along the edge of the water for them to eat; and it was not till daylight that our alarm vanished.

Jan. 15.--Having now ascertained, beyond a doubt, that the Mackenzie flowed to the north-east, I returned to the camp, resolved upon leaving it and renewing my course to the west-north-west and north-west; but, as it was extremely doubtful whether we should find water in travelling across the country without a leading watercourse, and as we had failed in procuring a sufficient quantity of game, I determined to take this favourable opportunity of killing a bullock before leaving the river.

Jan. 16.--On returning, we found our party encamped about four miles lower down the river than where I had left them. I then removed them to a more convenient spot about two miles still lower down (lat. 23 degrees 21 minutes 30 seconds). Just at the moment we were preparing to shoot the bullock, we heard the cooee of a native, and in a short time two men were seen approaching and apparently desirous of having a parley. Accordingly, I went up to them; the elder, a well made man, had his left front tooth out, whilst the younger had all his teeth perfect; he was of a muscular and powerful figure, but, like the generality of Australian aborigines, had rather slender bones; he had a splendid pair of moustachios, but his beard was thin. They spoke a language entirely different from that of the natives of Darling Downs, but "yarrai" still meant water. Charley, who conversed with them for some time, told me that they had informed him, as well as he could understand, that the Mackenzie flowed to the north-east. Brown found an empty seed-vessel of the Nelumbium, in their camp. At sunset we killed our bullock, and during the 17th and 18th occupied ourselves in cutting up the meat, drying it in the sun, frying the fat, preparing the hide, and greasing our harness. Charley, in riding after the horses, came to some fine lagoons, which were surrounded by a deep green belt of Nelumbiums. This plant grows, with a simple tap root, in the deep soft mud, bearing one large peltate leaf on a leaf stalk, about eight feet high, and from twelve to eighteen inches in diameter, the flower-stalk being of the same length or even longer, crowned with a pink flower resembling that of a Nymphaea, but much larger: its seed-vessel is a large cone, with perpendicular holes in its cellular tissue, containing seeds, about three quarters of an inch in length. We found the following shells in the river, viz.; two species of Melania, a Paludina, the lanceolate Limnaea, a cone-shaped Physa (?), a Cyclas with longitudinal ribs, and the Unio before described. Murphy shot an Ostioglossum, a Malacopterygious fish, about three feet long, with very large scales, each scale having a pink spot. We afterwards found this fish in the waters flowing into the Gulf of Carpentaria; both on its eastern and western sides: and, according to the natives of Port Essington, to whom I showed the dried specimen, it is also found in the permanent water-holes of the Cobourg peninsula.

Jan. 18.--Leaving my party to complete the process of drying and packing the charqui, I started with my two black companions to examine the country to the north-west. After passing the gullies in the immediate neighbourhood of the river, we came to sandstone ridges covered with an almost impenetrable scrub; chiefly composed of stiff and prickly shrubs, many of them dead, with dry branches filling the intervals. As no grass grew on the poor soil, the bush-fires--those scavengers of the forest--are unable to enter and consume the dead wood, which formed the principal obstacle to our progress. Difficult, however, as it was to penetrate such thickets with pack-bullocks, I had no choice left, and therefore proceeded in the same direction. In a short time, we reached an open Bricklow scrub containing many dry water-holes, which, farther on, united into a watercourse. We passed a creek flowing to the eastward to join the Mackenzie, and continued our route through patches of Bricklow scrub, alternating with Bastard-box forest, and open Vitex scrub, in which the Moreton Bay ash was very plentiful. About eight miles from our camp, we came upon an open forest of narrow-leaved Ironbark (E. resinifera) and Bastard-box, covering gentle slopes, from which shallow well-grassed hollows descended to the westward. Coming again on scrub, and following it down in a westerly direction, we came to a dry creek; and found water in holes along the scrub. Considering this a favourable place for the camp, I sent Charley back, to guide my party through the scrub; whilst I proceeded with Brown to examine the creek upwards, to the north-west. After a ride of about five miles, during which several fine lagoons were seen, we reached a prominent hill of sandstone formation, surrounded by a most beautiful, open, silver-leaved Ironbark forest, changing occasionally into plains without a tree. I ascended the hill, and obtained a very extensive view from its summit. A range of peaks bore N. 57 degrees W.; another range, with undulating outline, was seen to the south-east; and another less prominent range bore N. 45 degrees W. The hill is in latitude 23 degrees 10 minutes, and bears the name of Mount Stewart, in compliment to Mr. Stewart, veterinary surgeon of Sydney, to whom I am indebted for great assistance and most valuable advice.

Towards the north-east, the country appeared to be very level, with only one low ridge, apparently at a great distance. To the south, and also to the west, some long-stretched flat-topped hills were visible, several extending as far as the eye could reach. I continued my ride in the direction of the range of peaks to the north-west, over an undulating country of varied character, now extending in fine downs and plains, now covered with belts of thick Bricklow scrub, with occasional ridges of open silver-leaved Ironbark forest. Among the latter was a rather stunted gum-tree, with a black scaly butt; it was very frequent, and greatly resembled the Moreton Bay ash. The numerous watercourses which I crossed, were all dry; and, when the approach of night compelled us to select a camping place, which we did in a small grove of Bricklow, we should have been without water, had not a thunder-storm with light showers of rain, enabled us to collect about a quart of it to make some tea. The next morning we continued our examination, passing over a country of scrub, plain, and forest land; and made our breakfast, and watered our horses, at a small pool of water that was collected in a hole of a little creek, after the last night's thunder-storm. About four miles from this spot, we again found permanent water, near the scrub; and, at three miles farther on, crossed a fine creek, with a reedy bed, along which lightly timbered flats extended; and, about six miles to the W. N. W., we found another creek, separated from the former by openly timbered ridges, and occasional patches of scrub. The flats along this creek and its tributaries were covered with the most luxuriant grass; but are without permanent water, although at present supplied by the late thunder-storms. Brown gave chase to an emu with several young ones, but did not succeed in capturing any of them.