On coming up the others saw a beautiful watercourse, the bed of which was full of grass and water. This creek Sturt called Eyre's Creek, and it was one of the most important discoveries he made in this region. Along this watercourse they made easy stages until the 7th, when the creek was lost, and the water in the lagoons near the bank was found to be intensely salt. After repeated efforts to continue his journey, which only led him amongst the everlasting sand hills, separated by plains encrusted with salt, Sturt came to the erroneous conclusion that he was at the head of the creek, and further progress impossible. Had he but known it, he was within reach of permanently watered rivers, along which he could have travelled as far north as he wished. But there was neither sign nor clue afforded him; his men were sick, and his retreat to the depôt most precarious; there was nothing for it but to fall back again, and after a toilsome journey they reached the depôt, or Fort Grey as they had christened it, on the 2nd October. Sturt now made up his mind for a final effort due north, and in company with Stuart and two fresh men, he started on the 9th of October; and on the second day reached Strzelecki Creek, which was the name they had given to the first creek crossed on their late expedition. On the 13th, they arrived at the banks of a magnificent channel with grassy banks, fine trees and abundant water; this was the now well-known Cooper's Creek, one of the most important rivers of the interior, its tributaries draining the southern slopes of the dividing watershed in the north. Sturt on reaching this unexpected discovery was uncertain whether to follow its course to the eastward, or persevere in his original intention of pushing to the north. A thunder storm falling at the time made him adhere to his original course, and defer the examination of the new river until his return. In seven days after leaving Cooper's Creek, he had the negative satisfaction, as he expected, of gazing over the dreary waste of the stony desert, unchanged and forbidding as ever. They crossed it, and were again turned back by sand hill and salt plain, and forced to retrace their steps to Cooper's Creek. This creek Sturt followed upward for many days, but finding it did not take him in the direction he desired to go, and moreover, the large broad channel that they first came to, became divided into many small ones, which ran through flooded plains, making the travelling most tiring on their exhausted horses; he reluctantly turned back. They had found the creek well populated with natives, and the prospects of getting on were apparently better than they had ever met with before, but both Sturt and his men were weak and ill, and his horses thoroughly tired out, and also he was not sure of his retreat.