On returning to the ship at nine in the evening, I found lieutenant Fowler had quitted the shore with his tents and people, the holds were completed with water, and both vessels ready for sea. No. 2, the largest of the Percy Isles, is about thirteen miles in circumference; and in its greatest elevation perhaps a thousand feet. The stone is mostly of two kinds. A concreted mass of different substances, held together by a hard, dark-coloured cement, was the most abundant; I did not see either coral or pumice-stone in the composition, but it otherwise much resembled that of Aken's Island in Shoal-water Bay, and still more a stratum seen at the north-west part of Long Island: it was found at the tops of the highest hills, as well as in the lower parts. The second kind of stone is light, close-grained, and easily splits, but not in layers; it is of a yellowish colour, and probably argillaceous. The surface of the island is either sandy or stony, or both, with a small proportion of vegetable soil intermixed. It is generally covered with grass and wood; and some of the vallies round the basin might be made to produce vegetables, especially one in which there was a small run, and several holes of fresh water. The principal wood is the _eucalyptus_, or gum tree, but it is not large; small cabbage palms grow in the gullies, and also a species of fig tree, which bears its fruit on the stem, instead of the ends of the branches; and pines are scattered in the most rocky places. No inhabitants were seen upon any of the islands, but there were deserted fire places upon all. The Indians probably come over from the main land at certain times, to take turtle, in which they must be much more dexterous than we were; for although many turtle were seen in the water, and we watched the beaches at night, not one was caught. There are no kangaroos upon the Percy Isles; nor did we see any useful birds. The large bats or vampyres, common to this country, and called flying-foxes at Port Jackson, were often found hanging by the claws, with their heads downward, under the shady tops of the palm trees; and one solitary eel of a good size, was caught on clearing out the hole where our water casks had been first intended to be filled. Pines, fresh water, and fish will be some inducement to visit the Percy Isles; as perhaps may be the hump-backed whales, of which a considerable number was seen in the vicinity. The best and most convenient anchorage, and indeed the only one to be recommended, is that where the Investigator lay, directly off the basin; in mid-channel between No. 2 and the western pine islets. It is sheltered at fourteen points to the eastward, and three towards the west; and there being a clear passage out, both to the north and south, no danger is to be apprehended: the bottom, however, does not hold very well.