From this camp, one family only accompanied us. We journeyed due west over plains of great extent. The soil upon them was soft and yielding, in some places being a kind of light earth covered with rhagodiae, in others a red tenacious clay, overrun by the misembrianthemum and salsolae. Nothing could exceed the apparent barrenness of these plains, or the cheerlessness of the landscape. We had left all high lands behind us, and were now on an extensive plain, bounded in the distance by low trees or by dark lines of cypresses. The lofty gum-trees on the river followed its windings, and, as we opened the points, they appeared, from the peculiar effect of a mirage, as bold promontories jutting into the ocean, having literally the blue tint of distance. This mirage floated in a light tremulous vapour on the ground, and not only deceived us with regard to the extent of the plains, and the appearance of objects, but hid the trees, in fact, from our view altogether; so that, in moving, as we imagined, upon the very point or angle of the river, we found as we neared it, that the trees stretched much further into the plain, and were obliged to alter our course to round them. The heated state of the atmosphere, and the sandy nature of the country could alone have caused a mirage so striking in its effects, as this,--exceeding considerably similar appearances noticed during the first expedition. The travelling was so heavy, that I was obliged to make a short day's journey, and when we struck the river for the purpose of halting, it had fallen off very much in appearance, and was evidently much contracted, with low banks and a sandy bed. It was difficult to account for this sudden change, but when I gazed on the extent of level country before me, I began to dread that this hitherto beautiful stream would ultimately disappoint us. EXCURSION TOWARDS A RIDGE OF HILLS.