We started on the 26th, on a course somewhat to the N.W., and traversed plains of the same wearisome description as those I have already described. The wheels of the drays sank up to their axle-trees, and the horses above their fetlocks at every step. The fields of polygonum spread on every side of us like a dark sea, and the only green object within range of our vision was the river line of trees. In several instances, the force of both teams was put to one dray, to extricate it from the bed into which it had sunk, and the labour was considerably increased from the nature of the weather. The wind was blowing as if through a furnace, from the N.N.E., and the dust was flying in clouds, so as to render it almost suffocating to remain exposed to it. This was the only occasion upon which we felt the hot winds in the interior. We were, about noon, endeavouring to gain a point of a wood at which I expected to come upon the river again, but it was impossible for the teams to reach it without assistance. I therefore sent M'Leay forward, with orders to unload the pack animals as soon as he should make the river, and send them back to help the teams. He had scarcely been separated from me 20 minutes, when one of the men came galloping back to inform me that no river was to be found--that the country beyond the wood was covered with reeds as far as the eye could reach, and that Mr. M'Leay had sent him back for instructions. This intelligence stunned me for a moment or two, and I am sure its effect upon the men was very great. They had unexpectedly arrived at a part of the interior similar to one they had held in dread, and conjured up a thousand difficulties and privations. I desired the man to recall Mr. M'Leay; and, after gaining the wood, moved outside of it at right angles to my former course, and reached the river, after a day of severe toil and exposure, at half-past five. The country, indeed, bore every resemblance to that around the marshes of the Macquarie, but I was too weary to make any further effort: indeed it was too late for me undertake anything until the morning. ANXIOUS COGITATIONS; SURVEY OF RIVER AND ENVIRONS.