Started from the camp at 5.45 a.m., and steered south-south-east through the acacia wood to the lake, and then south by east across the dry bed of the lake towards a break in the trees on the southern side. Here we found a creek joining the lake from the south-west, in which there were some shallow pools. We then steered east, to intersect any channel by which the waters of the lake might flow to the south or south-east, and passing through a wood of acacia entered the sandy desert. As some low rocky hills were visible to the east we steered for them. At 2.10 halted half a mile from the hills, and then ascended them on foot. They were very barren and rocky, scarcely eighty feet above the plain, formed of sandstone, the strata horizontal. From the summit of the hill nothing was visible but one unbounded waste of sandy ridges and low rocky hillocks, which lay to the south-east of the hill. All was one impenetrable desert, as the flat and sandy surface, which could absorb the waters of the creek, was not likely to originate watercourses. Descending the hill, which I named Mount Wilson, after the geologist attached to the expedition, we returned towards the creek at the south end of the lake, reaching it at 9.30. 6th March. As the day was extremely hot and the horses required rest and food, we remained at the camp. Ducks were numerous in some of the pools, but so wild that only two were shot. The early part of the day was clear, with a hot strong breeze varying from west to south-east. At 1 p.m. there was a heavy thunder-squall from the south-east, which swept a cloud of salt and sand from the dry surface of the lake. The squall was followed by a slight shower. Latitude by Canopus 20 degrees 16 minutes 22 seconds. DRY BEDS OF SALT LAKES. 7th March.