Mount Inspection being the highest land in the neighbourhood, became the principal station of the survey. From it a glimpse was got of the mainland, bearing South 17 degrees West about eighteen miles. The north-eastern end of the island, also, could be seen, fronted with rocky ledges extending three quarters of a mile off. This hill is a mass of calcareous rock, similar to the high parts of Bountiful Island, with the same honeycombed surface, as if it had been exposed to the action of the sea. In other parts of the island there is a great quantity of ironstone; and the cliffs on the eastern side are mixed with this and pipe-clay; on the northern extreme are some lakes or swamps. SOIL, ETC. OF BENTINCK ISLAND. The soil is chiefly a mixture of sand and decomposed vegetable matter; but it cannot boast of fertility. The wood on the island, which consisted for the most part of gums, wattles, a few acacias, palms, and, near the beach, a straggling casuarina or two, bespoke this by its stunted appearance; but as cotton grows well at Port Essington, there can be little doubt that it will thrive here. Several of the bustards spoken of by Flinders, were noticed; but too wary to be killed. They were as large as those seen in the neighbourhood of Port Phillip, but much browner. The other birds, most common, will be found in an extract from the game book, given in a future page. We saw no animals, except some large iguanas. Investigator Road is sheltered to the northward by shoal water stretching across between Sweers and Bentinck islands. The latter is slightly elevated, and thickly wooded; it is large in comparison with its neighbours, being about ten miles in extent either way. Its south side is much indented, and the projections as well as the extreme of Fowler Island, are lined with mangroves; they are fronted with coral ledges. Near the south-east point, I noticed large patches of the ferruginous sort of gravel, before alluded to in King's Sound. On one occasion a party thought they heard a cooey--or cry peculiar to the natives of Port Jackson--uttered by some of the aborigines in the distance. It would have been exceedingly interesting to ascertain if this actually was the case; as the sound generally emitted by the natives of the northern coasts when they wish to communicate with each other afar off, is the monotonous "oh! oh!" MR. FORSYTH'S REPORT.