From the alarming increase of the leak which the MERMAID had sprung, it was found necessary to find a place to careen her in, in order, if possible, the damage might be repaired, that they might continue the survey, or, at least, ensure their safe return to Port Jackson. On the sandy beach of a bay, which they named Careening Bay, a place was found in every way suitable.

"These repairs were completed by the 28th, but just as we were congratulating ourselves upon having performed them, a fresh defect was discovered, which threatened more alarming consequences than the others. Upon stripping off some sheets of copper, the spike nails which fastened the planks were found to be decaying, and many were so entirely decomposed by oxidation that a straw was easily thrust through the vacant holes. As we had not enough nails to replace the copper, for that was now our only security, we could not venture to remove more than a few sheets from those parts which appeared to be the most suspicious, under all of which we found the nails so defective that we had reason to fear we might start some planks before we reached Port Jackson. . . When the repairs were completed, and the people were more at leisure, I made an excursion as far as Bat Island, off Cape Brewster. . . . Bat Island is a mass of sandstone superincumbent upon a quartzoze basis, and intersected by nearly vertical veins of white quartz, the surface of which was in a crystallised state. The floor of the cavern was covered with heaps of water-worn fragments of quartzoze rock containing copper pyrites, in some of which the cavities were covered by a deposit of greenish calcedony. The sides of the cavern had a stalagmitical appearance, but the recess was so dark that we could not ascertain either its formation or extent. . . . On first entering it we were nearly overpowered by a strong, sulphurous smell, which was soon accounted for by the flight of an incredible number of small bats, which were roosting in the bottom of the cave, and had been disturbed at our approach. We attempted to grope our way to the bottom, but not having a light, were soon obliged to give up its further examination. . . . From the summit of this place a set of bearings were obtained, particularly of the islands to the northward and westward, and Mr. Cunningham secured here specimens of eighteen different sorts of plants."

On the 9th, leaving Careening Bay, passing between Cape Brewster and the Coronation Islands, they enter a spacious sound, which received the name of Brunswick Sound. And here they also found and named the Prince Regent's River, afterwards the scene of Grey's discomfiture. Here it was patent that, in spite of their late repairs, the cutter leaked so much that, for the safety of the crew, King had reluctantly to return to Sydney; and when off Botany Bay, narrowly escaped total wreck during a dark and stormy night.

The tiny craft that had carried King so far and so safely was now laid up for repairs, and a brig of one hundred and fifty tons was purchased and re-christened the BATHURST. On the 26th of May, 1821, King sailed from Port Jackson upon his fourth and last voyage to the north coast, accompanied by the merchant ships DICK and SAN ANTONIO, bound for Batavia, who requested permission to accompany King through Torres Straits.

Meantime, the MERMAID had been thoroughly repaired and fitted out, leaving Port Jackson to carry the first establishment to Port Macquarie, on which service she was wrecked.

Their company now numbered thirty-three, but three days after they left port, King says:—

"A discovery was made of another addition to the crew. Upon opening the hold, which had been locked ever since the day before we sailed, a young girl, not more than fourteen years of age, was found concealed among the casks, where she had secreted herself in order to accompany the boatswain to sea. Upon being brought on deck she was in a pitiable plight . . . that her acquaintances, of which she had many on board, could scarcely recognise her. Upon being interrogated, she declared she had, unknown to all on board, concealed herself in the hold the day before the vessel sailed, and that her swain knew nothing of the step she had taken. As it was now inconvenient to return to put her on shore, and as the man consented to share his rations with her, she was allowed to remain; but in a very short time heartily repented of her imprudence, and would gladly have been re-landed, had it been possible."

Along the east coast the BATHURST was accompanied by the DICK and SAN
ANTONIO, both going north, and near the wreck of the FREDERICK, they had
a trifling brush with the natives. While here, Mr. Cunningham visited
Clack's reef:

"The reef abounded with shells, of which they brought back a large collection, but not in any great variety; an indifferent CYPRAEA was the most common, but there were also some VOLUTAE and other shells, besides trepang and ASTERIAE in abundance.

"Mr. Cunningham observed a singularly curious cavern upon the rock, of which he gave me a description in the following account of the island:—