At 4 P.M., we anchored in Blackwood Bay, in a depth of 10 fathoms. Point Dicky bearing South half a mile, and Mount Adolphus North-East. In the evening a plan was made of this very convenient stopping place for ships, and all the angles taken to the North-West extremity of the group, place them a mile and a half to the eastward of their position in the chart. Observations were also obtained near Point Dicky, which we found to be in latitude 10 degrees 38 3/4 minutes South and longitude 10 degrees 28 minutes East of Port Essington. The North-West extremity of the singular flat-topped hill being 1 minute 05 seconds North, and 45 seconds East of this spot. The first question interesting to ships is the supply of wood and water; the latter we had no time to look for, but of the former there was an abundance, though from the shore being fronted by extensive coral flats, it is difficult to be attained. The appearance of the island is similar to that of the Albany cluster, it having the same rocky, bleak, and almost wild look; from which I conclude they are of the same formation, which in general terms we may call porphyritic. Parts of the island appeared to be intersected by a growth of mangroves. There appeared great irregularity in the tides at this anchorage, as if there were a meeting of various streams. At 5 P.M. it was setting South-West about an hour, and continued to run in that direction until 8 hours 30 minutes, gradually decreasing its rate. It then took a North and by East direction with the same velocity, until half an hour after midnight, when it again changed back to South-South-West, a course it pursued during the remainder of our stay. By the rise of the water on the shore it would appear that the flood came from the westward. TORRES STRAIT.