Nearly the whole of the country passed over this day was an alluvial flat extending on the south-west to the grassy range already described, while to the north and east it extended for many miles, branching out into the numerous valleys that drain the different ranges in that direction; the grass and vegetation on these flats is not so rank as on that traversed the previous day, but more even, and the soil better adapted for agriculture; the amount of good land on this part of the Lyons River was estimated at 150 square miles, while on the tributaries between Mount Thompson and Mount Augustus I have no doubt that there is as much more. Water at this time was plentiful in the numerous channels that intersect the plain, their permanency being the only matter of doubt--our limited acquaintance with the nature of the seasons in these latitudes does not enable us to decide with any degree of certainty; the pools lower down the river are unquestionably of a permanent character, but many of them were already becoming brackish. The quantity of game seen in this part of the country was also a favourable indication. Turkeys, and a new variety of pigeon, having a brown back and slate-coloured breast, on the wing resembling a tame pigeon, congregate in flights sometimes of a thousand together; emus, cockatoos, quail, and parakeets are also very numerous, particularly the latter. 3rd June. A gentle ascent of two and a half miles brought us to the foot of Mount Augustus, where, leaving our horses in charge of Fairburn and Dugel, we commenced the ascent up the only accessible point on this side of the hill; it required two hours' heavy toil to bring us to the summit, the barometer gradually falling until it only registered 26.10, which, compared with the simultaneous observations kept at Champion Bay by Mr. H. Gray, gives an elevation of 3,480 feet above the level of the sea; the last 500 feet of the summit being clothed in thickets of melaleuca, amongst which grew a nondescript variety of red gum-tree, the only new thing observed in this locality. The air was fortunately very clear, enabling us to take bearings to almost every remarkable summit within eighty miles, and in two instances to hills more than a hundred miles distant.