The stars informed me, in the night, that I was almost under the tropic line, my latitude being 23 degrees 29'. The horses fed well on the purple vetch, their bells melodiously tinkling in the air the whole night long. The sound of the animals' bells, in the night, is really musical to the explorer's ear. I called the creek after Mr. Carmichael; and hoping it would contain good water lower down, decided to follow it, as it trended to the west. We found, however, in a few miles, it went considerably to the south of west, when it eventually turned up again to the north-west. We still had the main line of mountains on our right, or north of us: and now, to the south, another line of low hills trended up towards them; and there is evidently a kind of gap between the two lines of ranges, about twenty-five miles off. The country along the banks of Carmichael's Creek was open and sandy, with plenty of old dry grass, and not much triodia; but to the south, the latter and mallee scrub approached somewhat near. We saw several small ponds of water as we passed along, but none of any size. In seven or eight miles it split into several channels, and eventually exhausted itself upon an open grassy swamp or plain. The little plain looked bright and green. I found some rain water, in clay pans, upon it. A clay pan is a small area of ground, whose top soil has been washed or blown away, leaving the hard clay exposed; and upon this surface, one, two, three, or (scarcely) more inches of rain water may remain for some days after rain: the longer it remains the thicker it gets, until at last it dries in cakes which shine like tiles; these at length crumble away, and the clay pan is swept by winds clean and ready for the next shower. In the course of time it becomes enlarged and deepened. They are very seldom deep enough for ducks.