Our horses having but a very scanty feed at this place, we moved down the stream to obtain better grass for them before crossing the sand-plains which lay to the south. After following the stream west for two hours, encamped in a small grassy flat, below which the stream ceased to run, the water being wholly absorbed by the sandy soil, which has a substratum of limestone of recent formation. SEVENTY MILES OF SAND PLAIN. 4th November. Accompanied by Mr. Bedart, rode to the westward; passing over sandy plains and ridges for four hours, came to the beach, which we followed northwards for three hours, hoping to meet with the mouth of the stream on which our camp was placed. Not perceiving any signs of it, we turned to the east, and after an hour's struggle through a thick jungle, we came on a wet grassy flat, on which the stream seemed to be lost. Steering a general course of south-south-east, we arrived at 9.10 p.m. at the camp, after a ride of thirteen and a quarter hours, and the country traversed almost wholly worthless sand and scrub. 5th November (Sunday). Remained at our encampment to rest the horses. Read prayers. 6th November. Leaving our encampment at 7.10 a.m., we steered north 170 degrees east magnetic, along the limits of the low scrubby limestone hills which extend along this part of the coast. To the east the level sandy plain extended from eight to ten miles, and then rose into high sandstone hills, covered with scrub and destitute of trees; but at the junction of the limestone and sandstone formation, along which lay our route, were several small lagoons and swamps of fresh water, with grassy margins. At 10.0 altered the course to southward; the line of swamps trending to south-south-west, we entered the level sandy plain. At noon passed a shallow pool of rainwater in a slight depression of the plain, and shortly after crossed two small watercourses trending west; a little brackish water remained in the deeper portions of their channels. The effect of refraction on this level country, when heated by the midday sun, was so great as to cause many of the low sandy ridges to appear like large lakes and inlets of the sea, as in some instances the more distant hills were obscured by its effects. At 2.45 p.m. we reached the sandstone range, and at 3.5 halted in a small patch of grass around a native well of good water, which had the appearance of retaining water throughout the summer. While here we obtained several additions to our small collection of birds. MOUNTS PERON AND LESUEUR. 7th November.