August 27.--Pursuing our course to the eastward, towards the range of low hills bordering the plains in that quarter, between five and six miles, we came to a fine stream of water, crossing the plains from the south to the north. There had been a flood in this rivulet within these few days, marks of which were observed about fifteen feet high; but still within the banks. It appears that the plains are chiefly flooded from Yorke's Rivulet, the remaining waters of which, together with rain-water, were in several places still standing on the surface; but not to the extent that the horizontal level of these plains would have led me to suppose would probably be the case. The far greater portion was a rich dry soil, and that the water is never permanent on any part of them is clearly demonstrated by the total absence of any aquatic or bog plants. From this rivulet, the three main branches of these immense plains were clearly visible to the east by south-south-east, and north-east. Of the extent of the two former, we could only judge from the lofty bounding chains of hills in those quarters; and which we could not estimate to be nearer than from forty-five to fifty miles. Hardwicke's Range bounded these to the north-east, with many intervening beautiful hills and valleys. We found the distance across the plains to the hill where we stopped, to be upwards of fourteen miles on an east line. Chains and ridges of low forest hills, which gradually rise from the horizontal level, are scattered over these plains, and stand for the most part detached like islands; varying the scenery in a most picturesque manner, as they are generally clothed with wood of apple tree, cypress, and other species of eucalyptus, intermingled with various acacias in full flower. Mr. Evans ascended Mount Tetley to take bearings from it. He found the compass to be affected in a similar manner to that remarked on Loadstone Hill; the north point of it when placed on the rock, becoming the south. This remarkable alteration of the needle was also observed on several other hills in this vicinity, but in a less degree; the bearings generally varying from two to three points from the truth. On the hill under which we stopped this evening, named View Hill, the needle varied three points. In consequence of the heavy rains and recent floods, travelling on many parts of these plains was very heavy; the soil being a rick loose loam, of a dark red approaching to a black colour, but of great apparent fertility and strength: some hundreds of kangaroos and emus were seen in the course of the day. We killed several, the dogs being absolutely fatigued with slaughter: the game was by no means shy, but came close up to us, as if to examine us. Indeed I do not think they are much disturbed by natives, of whom we have seen few signs in this neighbourhood. The stream crossing the plains was named Bowen's Rivulet, in honour of Commissioner Bowen, of the Navy Board.