On its western, and north-western shores, I had ascertained by actual examination, that its basin was a very low level, clearly defined, and effectually inclosed by an elevated continuous sandy ridge, like the outer boundary of a sea-shore, its area being of immense extent, and its bed of so soft and yielding a nature, as to make it quite impossible to cross it. All these points I had decided positively, and finally, as far as regards that part of Lake Torrens, from near the head of Spencer's Gulf, to the most north-westerly part of it, which I visited on the 14th of August, embracing a course of fully 200 miles in its outline. I had done this, too, under circumstances of great difficulty, toil, and anxiety, and not without the constant risk of losing my horses, from the fatigues and privations of the forced labours I was obliged to impose upon them.
Having ascertained these particulars, and at so much hazard, relative to Lake Torrens, for so great a part of its course, what conclusion could I arrive at with regard to the character of its other half to the north-east, and east of Flinders ranges, as seen from Mount Hopeless, and Mount Serle points, nearly ninety miles apart! The appearances from the ranges were similar; the trend of all the watercourses was to the same basin, and undoubtedly that basin, if traced far enough, must be of nearly the same level on the eastern, as on the western side of the ranges. I had completely ascertained that Flinders range had terminated to the eastward, the north-east, and the north; that there were no hills or elevations connected with it beyond, in any of these directions, and that the horizon every where was one low uninterrupted level.
With such data, and under such circumstances, what other opinion could I possibly arrive at, than that the bed of Lake Torrens was nearly similar in its character, and equally impracticable in its eastern, as its western arm; and that, considering the difficulties I had encountered, and the hazards I had subjected myself to, in ascertaining these points so minutely on the western side, I could not be justified in renewing those risks to the eastward, where the nature and extent of the impediments were so self-evidently the same, and where there was not the slightest hope of any useful result being attained by it.
I was now more than a hundred miles away from my party; and having sent them orders to move back towards Mount Arden, I had no time to lose in following them. With bitter feelings of disappointment I turned from the dreary and cheerless scene around me, and pushing the horses on as well as circumstances would allow, succeeded in retracing ten miles of my course by a little after dark, having completed a stage of fully forty-five miles during the day. Here there was tolerable good grass, and plenty of water from the late rains, so that the horses were more fortunate on this excursion than usual. I observed the variation to be 4 degrees E.
September 3.—Travelling early, we made a long stage of about forty miles, and encamped with good grass and water. During the day we caught four young emus in the plains, which we roasted for supper, being very hungry, and upon short allowance, as I had not calculated upon remaining out so long; the black boy enjoyed them exceedingly, and I managed to get through one myself. They were about the size of full grown fowls.
September 4.—Making a very early start, we travelled twenty miles to the watercourse, where we had encamped on the 31st of August, striking it a little lower down. As I had left one or two trifles here, that I wished to take on with me, I sent the black boy for them, telling him to follow my tracks while I went slowly on. Upon finding that he did not overtake me so soon as I expected, I halted for some time, but still he did not come up, and I again proceeded; for as I had left my former track, I concluded he had taken that line, and thus missed me. Steering, therefore, across the hills, some of which were very stony and broken, I made for the Mundy, which I reached very late in the evening, and found the party safely encamped there.
I had rode fifty-five miles, and had been on horseback about thirteen hours, so that both myself and horse were well nigh knocked up. The black boy had not arrived, nor did he come up during the night.
The next day, becoming uneasy about his absence, I detained the party in the camp, and sent Mr. Scott to search for him, who fortunately met him almost immediately he had left us. The boy's detention had been occasioned by the fagged condition of his horse, which prevented the possibility of his overtaking me. As the day was wet, I did not move on, but gave the party a day's rest, whilst I employed myself in meditating upon the disappointment I had experienced, and the future steps it might be most advisable to take to carry out the objects of the expedition. I was still determined not to give up the undertaking,—but rather to attempt to penetrate either to the eastward or westward, and to try to find some other line of route that might afford a practicable opening to the interior.
September 6.—Moving on the party early to-day, I pushed steadily towards the depot near Mount Arden. In doing this, the favourable state of the weather enabled us to keep more in the open plains, and thus both to avoid a good deal of rough ground, and to shorten the road considerably.
Upon mustering the horses on the 9th, the overseer reported to me that one of them was lying down with a broken leg, and upon going to examine him, I found that it was one of the police horses kindly lent to the expedition by the Governor. During the night some other horse had kicked him and broken the thigh bone of the hind leg. The poor animal was in great pain and unable to rise at all, I was therefore obliged to order the overseer to shoot him. By this accident we lost a most useful horse at a time when we could but ill spare one.