Oxley still contrived to keep to what he took to be the main channel, although, as it now pursued its course amid a dense thicket of reeds, it was becoming more difficult with every succeeding mile. Oxley's seamanship, however, stood him in good stead, and although fallen logs now began to obstruct their passage, they kept doggedly on for another twenty miles. There was no diminution in the volume of the current that was now bearing them onward, and Oxley felt confident that he was approaching that hidden lake, wherein the inland waters mingled their streams, and of whose existence he thought he had now every reason to rest assured. Just as he was buoying his spirits up with these hopes, dreaming that in future he would be able proudly to say, We were the first that ever burst Into that silent sea, the river eluded all further pursuit by spreading out in every direction amongst the ocean of reeds that surrounded them. Wounded to the heart at this unlooked-for disappointment, Oxley, after vainly seeking for some clue or indication by which he could continue the search, had to 'bout ship and return to the camp of the night before. He says:-- "There was no channel whatever amongst these reeds, and the depth varied from five to three feet." Although he was still convinced that the "long sought-for Australian Sea" existed, he recognised the futility of continuing this search to the westward, in which direction some malignant genius seemed ever to persist in thwarting him; and so he regained the shelter of the depot at Mount Harris, with another tale of frustrated hopes. Evans, on his return from his scouting expedition to the north and north-east, had a more cheerful story to tell. The weather had been wet throughout, and the impassable nature of the country occasioned thereby had hampered him greatly; nevertheless he had struggled across the worst of the flat country, and in the north-east had come to a new river, which he named the Castlereagh. He was absent ten days, and on his return Oxley determined to abandon the Macquarie, which had proved even more deceptive and elusive than the Lachlan, and to strike out for the higher lands which Evans reported having seen. He left Mount Harris on July 20th, first burying a bottle there containing a written scheme of his intended movements, and some silver coin. Ten years afterwards, Captain Sturt made an ineffectual search for this bottle. Oxley had also buried a bottle at the point of his departure from the Lachlan. Mitchell search for it without success, and learned afterwards that it had been broken by the blacks.