When I first came on the Lynd, I supposed that it flowed either independently to the head of the gulf, or that it was the tributary of a river which collected the waters of the York Peninsula, and carried them in a south-west or south-south-west course to the head of the gulf of Carpentaria. Such a course would have corresponded to that of the Burdekin at the eastern side, and the supposition was tolerably warranted by the peculiar conformation of the gulf. I expected, therefore, at every stage down the Lynd, at every bend to the westward, that it would keep that course. But, having passed the latitude of the head of the gulf, as well as those of the Van Diemen and the Staaten rivers, the Lynd still flowed to the north-west; and then, when it joined the Mitchell, I imagined that the new river would prove to be the Nassau; but, when it passed the latitude of that river, I conjectured that it would join the sea at the large embouchure in the old charts, in latitude 15 degrees 5 minutes--the "Water Plaets" of the Dutch navigators. To follow it farther, therefore, would have been merely to satisfy my curiosity, and an unpardonable waste of time. Besides, the number of my bullocks was decreasing, and prudence urged the necessity of proceeding, without any farther delay, towards the goal of my journey. I determined therefore to leave the Mitchell at this place, and to approach the sea-coast--so near at least, as not to risk an easy progress--and to pass round the bottom of the gulf.

June 26.--We travelled, accordingly, about seven miles almost due west, the latitude of our new camp being 15 degrees 52 minutes 38 seconds. On our way we passed some very fine long water-holes; some of which were surrounded with reeds, and others covered with the white species of Nymphaea; groves of Pandanus spiralis occupied their banks. Some fine plains, full of melon-holes, but well grassed, separated from each other by belts of forest-land, in which the Pandanus was also very frequent, were crossed during the day.

June 27.--We travelled eight miles W.S.W. over a succession of plains separated by belts of forest, consisting of bloodwood, box, apple-gum, and rusty-gum. Some plains were scattered over with Bauhinias. The holes along the plains are probably filled with water during the rainy season; dead shells of Paludina were extremely numerous, and we found even the shield of a turtle in one of them. At the end of the stage, we skirted some dense scrub, and encamped at one of the lagoons parallel to a dry creek, which must belong to the Nassau, as its latitude was 15 degrees 55 minutes 8 seconds. The lagoon was covered with small white Nymphaeas, Damasoniums, and yellow Utricularias; and on its banks were heaps of mussel-shells. The smoke of natives' fires were seen on the plains, in every direction; but we saw no natives. Brown approached very near to a flock of Harlequin pigeons, and shot twenty-two of them. A young grey kangaroo was also taken.

The kites were so bold that one of them snatched the skinned specimen of a new species of honey-sucker out of Mr. Gilbert's tin case; and, when we were eating our meals, they perched around us on the branches of overhanging trees, and pounced down even upon our plates, although held in our hands, to rob us of our dinners;--not quite so bad, perhaps, as the Harpies in the Aeneid, but sufficiently so to be a very great nuisance to us.

Yesterday and to-day we experienced a cold dry southerly wind, which lasted till about 11 o'clock A. M., when it veered to the south-west, but at night returned again, and rendered the air very cold, and dry, which was very evident from the total absence of dew. The forenoon was very clear; cumuli and cirrho-cumuli gathered during the afternoon. The sky of the sunset was beautifully coloured. After sunset, the clouds cleared off, but, as the night advanced, gradually collected again.

A circumstance occurred to-day which gave me much concern, as it showed that the natives of this part were not so amicably disposed towards us as those we had hitherto met:--whilst Charley and Brown were in search of game in the vicinity of our camp, they observed a native sneaking up to our bullocks, evidently with the intention of driving them towards a party of his black companions, who with poised spears were waiting to receive them. Upon detecting this manoeuvre, Charley and his companion hurried forward to prevent their being driven away, when the native gave the alarm, and all took to their heels, with the exception of a lame fellow, who endeavoured to persuade his friends to stand fight. Charley, however, fired his gun, which had the intended effect of frightening them; for they deserted their camp, which was three hundred yards from ours, in a great hurry, leaving, among other articles, a small net full of potatoes, which Charley afterwards picked up. The gins had previously retired; a proof that mischief was intended.

June 28.--We crossed the creek, near which we had encamped, and travelled about nine miles wost, over most beautifully varied country of plains, of forest land, and chains of lagoons. We crossed a large creek or river, which I believed to be the main branch of the Nassau. It was well supplied with water-holes, but there was no stream. Loose clayey sandstone cropped out in its bed, and also in the gullies which joined it. A small myrtle tree with smooth bark, and a leafless tree resembling the Casuarina, grew plentifully on its banks. We saw smoke rising-in every direction, which showed how thickly the country was inhabited. Near the lagoons we frequently noticed bare spots of a circular form, about twelve or fifteen feet in diameter, round each of which was a belt of ten, twelve, or more fire places, separated from each other by only a few feet. It seems that the natives usually sit within the circle of fires; but it is difficult to know whether it belonged to a family, or whether each fire had an independent proprietor. Along the Lynd and Mitchell, the natives made their fires generally in heaps of stones, which served as ovens for cooking their victuals. Bones of kangaroos and wallabies, and heaps of mussel-shells, were commonly seen in their camps; but fish bones were very rarely observed. It was very different, however, when we travelled round the head, and along the western side, of the gulf; for fish seemed there to form the principal food of the natives.

At the end of our stage, we came to a chain of shallow lagoons, which were slightly connected by a hollow. Many of them were dry; and fearing that, if we proceeded much farther, we should not find water, I encamped on one of them, containing a shallow pool; it was surrounded by a narrow belt of small tea trees, with stiff broad lanceolate leaves. As the water occupied only the lower part of this basin, I deposited our luggage in the upper part. Mr. Roper and Mr. Calvert made their tent within the belt of trees, with its opening towards the packs; whilst Mr. Gilbert and Murphy constructed theirs amongst the little trees, with its entrance from the camp. Mr. Phillips's was, as usual, far from the others, and at the opposite side of the water. Our fire place was made outside of the trees, on the banks. Brown had shot six Leptotarsis Eytoni, (whistling ducks) and four teals, which gave us a good dinner; during which, the principal topic of conversation was our probable distance from the sea coast, as it was here that we first found broken sea shells, of the genus Cytherea. After dinner, Messrs. Roper and Calvert retired to their tent, and Mr. Gilbert, John, and Brown, were platting palm leaves to make a hat, and I stood musing near their fire place, looking at their work, and occasionally joining in their conversation. Mr. Gilbert was congratulating himself upon having succeeded in learning to plat; and, when he had nearly completed a yard, he retired with John to their tent. This was about 7 o'clock; and I stretched myself upon the ground as usual, at a little distance from the fire, and fell into a dose, from which I was suddenly roused by a loud noise, and a call for help from Calvert and Roper. Natives had suddenly attacked us. They had doubtless watched our movements during the afternoon, and marked the position of the different tents; and, as soon as it was dark, sneaked upon us, and threw a shower of spears at the tents of Calvert, Roper, and Gilbert, and a few at that of Phillips, and also one or two towards the fire. Charley and Brown called for caps, which I hastened to find, and, as soon as they were provided, they discharged their guns into the crowd of the natives, who instantly fled, leaving Roper and Calvert pierced with several spears, and severely beaten by their waddies. Several of these spears were barbed, and could not be extracted without difficulty. I had to force one through the arm of Roper, to break off the barb; and to cut another out of the groin of Mr. Calvert. John Murphy had succeeded in getting out of the tent, and concealing himself behind a tree, whence he fired at the natives, and severely wounded one of them, before Brown had discharged his gun. Not seeing Mr. Gilbert, I asked for him, when Charley told me that our unfortunate companion was no more! He had come out of his tent with his gun, shot, and powder, and handed them to him, when he instantly dropped down dead. Upon receiving this afflicting intelligence, I hastened to the spot, and found Charley's account too true. He was lying on the ground at a little distance from our fire, and, upon examining him, I soon found, to my sorrow, that every sign of life had disappeared. The body was, however, still warm, and I opened the veins of both arms, as well as the temporal artery, but in vain; the stream of life had stopped, and he was numbered with the dead.

As soon as we recovered from the panic into which we were thrown by this fatal event, every precaution was taken to prevent another surprise; we watched through the night, and extinguished our fires to conceal our individual position from the natives.

A strong wind blew from the southward, which made the night air distressingly cold; it seemed as if the wind blew through our bodies. Under all the circumstances that had happened, we passed an anxious night, in a state of most painful suspense as to the fate of our still surviving companions. Mr. Roper had received two or three spear wounds in the scalp of his head; one spear had passed through his left arm, another into his cheek below the jugal bone, and penetrated the orbit, and injured the optic nerve, and another in his loins, besides a heavy blow on the shoulder. Mr. Calvert had received several severe blows from a waddi; one on the nose which had crushed the nasal bones; one on the elbow, and another on the back of his hand; besides which, a barbed spear had entered his groin; and another into his knee. As may be readily imagined, both suffered great pain, and were scarcely able to move. The spear that terminated poor Gilbert's existence, had entered the chest, between the clavicle and the neck; but made so small a wound, that, for some time, I was unable to detect it. From the direction of the wound, he had probably received the spear when stooping to leave his tent.