Upper Head, bearing S. 28° 22' W. Double Mount. S. 53 20 E. Pine Mount, S. 61 5 E. These bearings place the inner end of Thirsty Sound in latitude 22° 16'; and curtail the distance of thirty miles from Pier Head in captain Cook's chart, to twelve miles and a half. TUESDAY 21 SEPTEMBER 1802 On the 21st, the botanical gentlemen went over in the launch to the east side of Thirsty Sound, the main land having been always found more productive in the objects of their pursuit, than any island however large. I went to examine along the west side of Long Island; but had not proceeded two miles before an opening presented itself amongst the mangroves. It led to the eastward, and then separated into two branches; and in following that which trended north-east I came into Thirsty Sound, and landed five miles above the inner entrance, at an islet in mid-channel, which had been set from Pier Head and is laid down by captain Cook. No less than five different pieces of land were found to be cut off from the south end of Long Island, by winding channels amongst the mangroves; and I now saw the prospect of a passage through the middle, leading out at the bight between the north point and Pier Head. A woody and rather elevated islet obscures the inner end of the opening, and seems to have prevented captain Cook's observing this separation when going up Thirsty Sound in his boat. I found in it a good bottom, with 3 to 5 fathoms water, and room for a ship to swing, or sail through as far as the outer opening to sea; but another island lies in the outlet, the bottom is rocky, and the regular depth at low water is not so much as 3 fathoms on either side. Having taken a second set of angles, and passed out by the new opening, I steered northward along the east side of Long Island; but although the land be high and rather steep, there was seldom so much as 3 fathoms at a mile distance. I landed at the north end of the island, to ascertain better the forms and positions of the North-point Isles; and then, steering southward along the west side, entered a cove where the form of the surrounding land gave a hope of finding fresh water for the ship; but the borders were covered with mangroves, and we could not get sufficiently far up to know whether any part of the stream running through them were fresh. Another set of angles was taken from a hill on the south side of the cove; and the sun being then set, our tent was pitched for the night. WEDNESDAY 22 SEPTEMBER 1802