The horses had strayed so far in search of green grass that we did not start till 10.30 a.m., when we steered south-east, crossing a spur of the tableland which lay to the south-west; then crossing several valleys and small watercourses trending to the north-east, camped at a shallow waterhole at 3.20 p.m. The country was of sandstone formation and the soil very poor, melaleuca scrubs prevailing on the lower ground, and eucalypti, acacia, and grevillia on the hills; to the south-west the hills were rocky, with a rounded outline, but to the north-east they were flat-topped and of less height. The sandstones are often at a considerable angle, but in no general direction, a thin bed of ferruginous conglomerate rests on hard gray sandstone, imperfectly stratified, beneath which shales of various colours exist; on the exposed surface of the shales observed an efflorescence of sulphate of magnesia. Latitude by a Coronae Borealis and a Trianguli Australis 15 degrees 18 minutes 48 seconds. SCARCITY OF GRASS. 24th July. Resuming our route at 7.20 a.m., steered south-east and ascended a sandstone range with horizontal strata and very abrupt on the south-east side. Entering a wide valley, crossed two small watercourses, the second of which was running apparently from springs, as several clumps of the melaleuca grew on the slope of the sandstone hills from which they came. Crossing a second spur of the tableland, descended to a small creek with waterholes and narrow grassy flats, the general character of the country being very poor and scrubby. Latitude by a Coronae Borealis and a Trianguli Australis 15 degrees 38 minutes 56 seconds. 25th July. At 7.40 a.m. left the camp, and steered south-east through a succession of miserable scrubs of eucalypti, grevillia, acacia, and jacksonia, with patches of melaleuca. At 1.30 p.m. crossed a ridge of steep sandstone rocks, and gradually descended till 2.55, when we camped on a small gully coming from the south, and in which a little water remained, and on the bank some dry grass of very inferior kind. Since leaving the Roper River the general character of the country has been worthless; the small size of the watercourses indicating an arid country to the south-west of our route. Few traces of blacks have been seen, though vast columns of smoke rise to the east and south-east; animals or birds are rarely seen. The rocky nature of the country has caused the horses' shoes to wear out rapidly, and the day seldom passes without having to replace the shoes of several of the horses. Latitude by a Coronae Borealis and a Trianguli Australis 15 degrees 40 minutes 19 seconds. 26th July.