The Percy Isles: anchorage at No. 2. Boat excursions. Remarks on the Percy Isles; with nautical observations. Coral reefs: courses amongst them during eleven days search for a passage through, to sea. Description of a reef. Anchorage at an eastern Cumberland Isle. The Lady Nelson sent back to Port Jackson. Continuation of coral reefs; and courses amongst them during three other days. Cape Gloucester. An opening discovered, and the reefs quitted. General remarks on the Great Barrier; with some instruction relative to the opening. [EAST COAST. PERCY ISLES.] TUESDAY 28 SEPTEMBER 1802 On quitting Broad Sound, we steered for the north-easternmost of the Northumberland Islands., which I intended to visit in the way to Torres' Strait. These are no otherwise marked by captain Cook, than as a single piece of land seen indistinctly, of three leagues in extent; but I had already descried from Mount Westall and Pier Head a cluster of islands, forming a distinct portion of this archipelago; and in honour of the noble house to which Northumberland gives the title of duke, I named them _Percy Isles_. (Atlas, Plate XI.) At noon, the observed latitude on both sides was 21° 51' 20"; the west end of the largest North-point Isle bore S. 18° W. three or four leagues, and the Percy Isles were coming in sight ahead. The weather was hazy; and the wind at E. S. E. preventing us from fetching No. 2, the largest isle, we tacked at five o'clock, when it bore S. 31° to 54° E, two or three leagues; No. 5, the north-westernmost of the cluster, bearing N. 24° W., two miles and a half. At dusk the anchor was dropped in 14 fathoms, sandy ground, two or three miles from some rocky islets which lie off the west side of No. 2. The flood tide at this anchorage came from the north-east, one mile per hour.