Having ascertained that the party could be moved across the range to the basalt plains with advantage, commenced our return to the camp by a westerly route across the plain, which rose gently for ten miles, and was well grassed, but thinly wooded; the soil was stony, with fragments of altered sandstone and basalt. On the higher part of the plain there were several hills of trap-rock, forming flat-topped ridges trending north and south; the highest of these we named Mount Sanford, and the plains Roe's Downs. The country now generally sloped to the bank of the creek near the western limit of the plain, at which, after six hours' ride, we halted at 11.35. The banks of the creek are of trap-rock; but the sandstone is exposed in the bed; the pools of water are deep and apparently permanent. At 4.0 resumed our route and passed over about one mile of sandstone, and then two miles of basalt, and bivouacked at a small gully at the western limit of the valley. 27th January. At 5.30 a.m. steered north-north-west, over several ridges of sandstone, till we struck our outward track, which we followed with some deviations to the camp, which was reached at 2.0 p.m. The evening was cloudy with a smart thunder-shower. Dr. Mueller informed me that he had traced the river about six miles to the west-south-west, but that beyond that point it appeared to come from the north-west, in which direction there was a low range of hills. 28th January. Having collected the horses, at 7.15 a.m. steered south to the rocky creek, and followed it down to the rocky gorge and encamped. As the valley was completely walled in by steep rocks, it appeared to be a suitable spot for a depot camp, as it would prevent the horses from straying; and, from the rapidity with which the water in the creeks was drying up, it became desirable that no time should be lost in pushing to the head of the Victoria while it was practicable to cross the ranges in which it was supposed to rise; but as many of the horses were quite unfit for the journey, it became necessary to leave them in some convenient spot while a small party pushed on with a light equipment. FORM A DEPOT CAMP. 29th January. Preparing equipment for the party proceeding to the interior and making arrangements for the formation of the depot camp; the party to consist of myself, Mr. H. Gregory, Dr. Mueller, and C. Dean, Mr. Baines remaining at the depot in charge. Selected eleven of the strongest horses and had them re-shod; fitted four with riding and seven with pack saddles. The following provisions were packed for the journey: 150 pounds pork, 300 pounds flour, 50 pounds rice, 10 pounds sago, 8 pounds tea, 6 pounds coffee, 48 pounds sugar. 30th January.