Passing Point Barrow we anchored near the north end of a large reef, Cape Melville bearing West-North-West ten miles. Here we felt a swell rolling in from seaward, and during the day there had been a current in our favour, of about a mile an hour. From the haze on the horizon, noticed from this anchorage, as well as on passing Cape Melville, I believe the outer edge of the Barrier Reef to be not more than four or five leagues distant from the land. Our attention had been previously directed by Captain King and others, to the singular appearance of the rocks on Cape Melville; indeed no one can pass this remarkable projection without being struck by the strange manner in which piles of reddish-coloured stones are scattered about in the utmost confusion, and in every possible direction over this high ridge. I much regretted that on passing next morning there was no opportunity of landing to see the nature of this confused mass; judging, however, from the result of my examination of a similar appearance presented by Depuch Island on the north-west coast, I believe this point to be of volcanic origin. CAPE FLINDERS. Between the rocks off Cape Melville, and a reef encircling two small islets, the channel is not more than a mile in width: indeed, I consider passing this point and Cape Flinders the most intricate part of the inner route. After rounding the rocks off the former we steered for the latter Cape, keeping it a little on the port bow; this course led us on reef a, lying midway between the Cape and a low island to the North-East. When on the southern extremity Cape Flinders bore South 70 degrees West 3 miles, and Clack Island North 39 degrees West. The latter is a remarkable cliffy lump, interesting from the circumstance of Mr. Cunningham having found native drawings in its caves. After clearing this danger, and passing the Cape, we steered across Princess Charlotte Bay, keeping wide to the southward of the reefs fronting it, in order that we might the more easily distinguish them; the sun at that time of the day being in the direction of the ship's head. The soundings gradually decreased with a soft muddy bottom, as we approached the eastern shores of the bay; which is so large and free from shoals, that a vessel not wishing to anchor might pass the night standing off and on with perfect safety. There is over the head of this bay a remarkable level-topped hill, called by Captain Cook, Janes' tableland; rendered the more conspicuous from the low nature of the surrounding country. SECTION OF CORAL REEF.