Dec. 6.--The natives visited us again this morning, and it was evident that they had not been with their gins. They invited us to come to their camp; but I wished to find a crossing place, and, after having tried in vain to pass at the foot of the rocky hills, we found a passage between the lagoons, and entered into a most beautiful valley, bounded on the west, east, and south by abrupt hills, ranges, and rocks rising abruptly out of an almost treeless plain clothed with the most luxuriant verdure, and diversified by large Nymphaea lagoons, and a belt of trees along the creek which meandered through it. The natives now became our guides, and pointed out to us a sound crossing place of the creek, which proved to be the head of the salt-water branch of the East Alligator River. We observed a great number of long conical fish and crab traps at the crossing place of the creek and in many of the tributary salt-water channels; they were made apparently of Flagellaria. Here I took leave of our guides: the leader of whom appeared to be "Apirk," a young and slender, but an intelligent and most active man. We now travelled again to the northward, following the outline of the rocky ridges at the right side of the creek; and, having again entered upon the plains, we encamped at a very broad, shallow, sedgy, boggy lagoon, surrounded with Typhas, and crowded with ducks and geese, of which Brown shot four. It was about four miles east of our yesterday's camp. Numerous flocks of the Harlequin pigeon (Peristera histrionica, GOULD) came to drink at this lagoon; and innumerable geese alighted towards the evening on the plain, and fed on the young grass, moistened by the rain. The number of kites was in a fair proportion to that of the geese; and dozens of them were watching us from the neighbouring trees. We found a new Eugenia, a tree of rather stunted growth, with broad opposite leaves, and fruit of the size of an apple, of a delicate rose-colour, and when ripe, a most delicious refreshment during a hot day. We had frequently met with this tree on sandstone ridges, and in sandy soils, but had never before found it in fruit. The day was distressingly hot, but we had several light showers during the afternoon.