September 20. — Our route to-day was through a perfect desert, very scrubby and stony, with much prickly grass growing upon the sand ridges, which alternated with the hard limestone flats; there were very few clear intervals of country upon our whole course; and for the last five miles the heavy sand and dense scrub made it very difficult to get on at all. After a long stage of twenty-five miles nearly due east, we halted at a high ridge similar to that upon which we encamped last night, with sheets of granite exposed on its surface, and rain water lodged in the hollows. The horses were all completely knocked up with the severe labour of this day’s stage; I ascertained the latitude of the camp to be 32 degrees 47 minutes 40 seconds S. and the variation of the compass which increased as we advanced to the eastward, was now 4 degrees 12 minutes E. The Gawler range was now distinctly visible, extending from N. 15 degrees W. to N. 65 degrees E. and presenting the broken and picturesque outline of a vast mountain mass rising abruptly out of the low scrubby country around. The principal elevations in this extensive range, could not be less than two thousand feet; and they appeared to increase in height as the range trended to the north-west. To the eastward the ranges decreased somewhat in elevation, but were still very lofty.