The wind for the last few days has been westerly; cumuli forming during the day, dissolved towards sunset; the days were very hot, the nights mild and dry. It was evident that we had descended considerably into the basin of the gulf. June 9.--We travelled about ten miles north-west. Box-tree flats, of more or less extent, were intercepted by abrupt barren craggy hills composed of sandstone, which seemed to rest on layers of argillaceous rock. The latter was generally observed at the foot of the hills and in the bed of the river; it had in most places been worn by the action of water. The stringy-bark became even numerous on the flats, in consequence of the more sandy nature of the soil: but the hills were scrubby, and Mr. Gilbert reported that he had even seen the Bricklow. The grass of the Isaacs grew from twelve to fifteen feet high, in the hollows near the river, which was, as usual, fringed with Sarcocephalus; a species of Terminalia; the drooping tea-tree; and with an Acacia which perfumed the air with the fragrant odours of its flowers. We gathered some blossoms of the drooping tea-tree, which were full of honey, and, when soaked, imparted a very agreeable sweetness to the water. We frequently observed great quantities of washed blossoms of this tree in the deserted camps of the natives; showing that they were as fond of the honey in the blossoms of the tea-tree, as the natives of the east coast are of that of the several species of Banksia. June 10.--We travelled about five miles north-north-west to latitude 17 degrees 9 minutes 17 seconds. The flats, the rugged hills, and the river, maintained the same character. Creeks, probably of no great extent, joined the Lynd from the south side of all the hills we passed both yesterday and to-day. The weather was very fine, although exceedingly hot during the day; but the nights were mild, and without dew. An easterly and south-easterly wind blew during the whole day, moderated a little at sunset, and again freshened up after it; but the latter part of the night, and for an hour and a half after sunrise, was calm. I was induced to think that this wind originated from the current of cold air flowing from the table-land of the Burdekin down to the gulf, as the easterly winds west of New England do, and as the westerly winds of Sydney during July and August, which are supposed to be equally connected with the table-land of New England and of Bathurst. The westerly winds occurring at the upper Lynd, do not militate against such a supposition, as they might well belong to an upper current coming from the sea. Two new fishes were caught; both were very small; the one malacopterygious, and resembling the pike, would remain at times motionless at the bottom, or dart at its prey; the other belonged to the perches, and had an oblong compressed body, and three dark stripes perpendicular to its length; this would hover through the water, and nibble at the bait. Silurus and Gristes were also caught.