May 8.--As I found it necessary to follow the right bank of the river, in order to get out of this intricate country, I sent Mr. Gilbert and Charley to trace the river through the valley of lagoons. Having accomplished their object, they informed me that the river had no connexion with the lagoons of the large valley, but that several very large ones were even on its left bank; and that all tree vegetation disappeared from its banks where it passed through a part of the valley of lagoons. May 9.--As my bullocks were still extremely foot-sore, it was necessary that we should travel only by short stages until they recovered; consequently, the day's journey did not exceed five miles in a N.N.E. direction; and, with the exception of some ridges, upon excellent travelling ground, along the left bank of the river. The latter formed, as I have already stated, the line of separation, first, between basalt and granite, and afterwards between basalt and a quartzose rock (probably baked Psammite). The country was beautifully open and well grassed; the river forming a simple channel, without trees, well filled with water and flowing between chains of lakes and lagoons on either side; one of which was covered with flocks of ducks and pelicans, resembling islands of white lilies. Beyond the almost treeless flats round the lagoons, Casuarinas and Callistemon re-appeared along the river. We saw some Blackfellows in the distance, who immediately withdrew as we approached them; but the tribe, which we had met at Reedy Brook, came to the other side of the river, and had much to say; we did not, however, take any notice of them, until we had unloaded our bullocks and finished our luncheon, when I went down to them, and gave them a horn of one of our slaughtered bullocks. Roper had saved the mane of his horse, and threw it over to them, but it seemed to frighten them very much. We inquired by signs as to the course of the river, and we understood by their answers, that it came a long way from the northward. At Reedy Brook the natives had given my companions to understand that the brook had its source not very far off to the W.N.W., by pointing at their heads, then at the brook, and then in the direction mentioned. I was therefore inclined to trust to their information about the river's source. They threw some yam-roots over to us, the plant of which we were not able to ascertain: and after that they retired.