Their first important discovery on a westerly course was a large river coming from the south, which they named the Fortescue. This stream they followed up until impeded by a very narrow, precipitous gorge, when they left the river, and made for a range they had sighted to the south. This range, which was called Hammersley Range, they attempted to cross, without success, so the explorers turned to the north-east, and came again on the Fortescue, above the gorge, and after some difficulty traced it to the range, through which it forced a passage. Crossing the range, partly by the aid of the river-bed, and partly by a gap, they came to fair average country stretching away to the southward. On this course the large and important river, the Ashburton, was found, which was traced upwards, flowing through a very large extent of good pastoral country. On the 25th of June, from the top of a sandstone tableland, they sighted Mount Augustus, at the head of the Lyons River. The view was most promising. Open forest and undulating country took the place of the everlasting scrubs and rocks, that had been such common objects with them, and well satisfied with what they saw the explorers turned north. Mount Samson and Mount Bruce, two most prominent peaks of the Hammersley Range, were named by Gregory on his return; the latter being considered by him the highest point in Western Australia. From here they struck back to the coast, their horses having become terribly foot-sore, and reached the sea forty miles from Nickol Bay, and on the 19th arrived at their rendezvous in that bay, where the ship was awaiting them. After a rest of ten days, Gregory started again, and to the eastward found the Yule River; thence they crossed to the Shaw, and still pushing east they succeeded in penetrating a considerable way into the tableland, where they found good grass and springs. On the 26th of August a fine stream running to the north was discovered, and named the De Grey; and after crossing ail immense plain they came to another river, which was christened the Oakover. Up this river Gregory went, the men admiring the rich foliage of the drooping ti-trees that bordered the long reaches of water, and the horses appreciating the wide grassy flats on either bank. Finding the course of the river trending too much westerly, they crossed to a tributary of the Oakover and thence passed easterly through a small range. Here he was confronted by a most unwelcome sight. Before him were the hills of drifted sand, the barren plains and the ominous red haze of the desert. So far he had encountered fewer obstacles and made more encouraging discoveries than had fallen to the lot of any other Western Australian explorer; and now, the desert had drawn its forbidding hand suddenly across his track, and sternly ordered him to halt.