After passing the stony ridge the valley became wider, the hills receding suddenly, in longitude 140 degrees 30 minutes, both to the north and south; and the whole of the country to the west seemed to consist of a succession of low ridges of red sand and level plains of dry mud, subject to inundation. Shortly before reaching the branch of Cooper's Creek named by Captain Sturt Streletzki Creek, we observed the tracks of two horses, one apparently a cart-horse, and the other a well-bred animal, but as none of their tracks were within the last month, the rain had obliterated them to such an extent that they could not be traced up, as they had left the bank of the creek on the first fall of rain, as is the usual habit of horses whose wanderings are uncontrolled. There can be little doubt that these horses belonged to Captain Sturt, who left one in an exhausted state near this locality, and also lost a second horse, whose tracks were followed many miles in the direction of this part of Cooper's Creek. 16th June. Streletzki Creek, which separates nearly at a right angle from the main channel, appears to convey about one-third of the waters of Cooper's Creek nearly south, and, as we afterwards ascertained, connects it with Lake Torrens. We, however, continued to follow the channels which trended west for thirty miles, but large branches continually broke off to the south and west, and at length the whole was lost on the wide plains of dry mud between the sand ridges; and, as there was no prospect of either water or grass to the west, I steered south and south-east for fifty miles over a succession of ridges of red drift sand, ten to fifty feet high, running parallel to each other, and in a nearly north and south direction. Between these ridges we occasionally found shallow puddles of rainwater, or rather mud, as it was so thick with clay as to be scarcely fluid. Fortunately a great quantity of green weeds had grown up since the rain, and the horses improved in condition, and did not require much water. 21st June to 25th June.