We saw several kangaroos, and their tracks to the water showed that they were numerous. One of them, which we saw in the creek, was of a light grey colour, with rich fur and a white tail. May 19.--We returned to the camp. A cold easterly wind continued during the day; low rainy clouds in the morning formed into heavy cumuli during the afternoon. My geological observations lead me to the conclusion, that an immense valley between granitic ranges has here been filled by a more modern basaltic eruption, which (supposing that Mount Lang is basaltic in the centre of elevation) rose in peaks and isolated hills, but formed in general a level table land. The basalt has been again broken by still more recent fissures, through which streams of lava have risen and expanded over the neighbouring rock. May 20.--We moved our camp about eighteen miles N.N.W., to Separation Creek, the latitude of which was 18 degrees 2 minutes 22 seconds. John Murphy found Grevillea chrysodendron in blossom, the rich orange colour of which excited general admiration. The stringy-bark tree, and Tristania, were growing on the sandy soil, and the latter near watercourses. Several native bustards (Otis Novae Hollandiae, GOULD.) were shot, and I found their stomachs full of the seeds of Grewia, which abounded in the open patches of forest ground. In crossing a plain we observed, under the shade of a patch of narrow-leaved tea trees, four bowers of the bowerbird, close together, as if one habitation was not sufficient for the wanton bird to sport in; and on the dry swamps I mentioned above, small companies of native companions were walking around us at some distance, but rose with their sonorous cu-r-r-r-ring cry, whenever Brown tried to approach them. [The natives of Argyle call the cry of the native companion, Ku-ru-duc Ku-ru-duc; the natives of Port Essington call the bird Ororr.--NOTE BY CAPT. KING]