Soon after starting this morning we came upon a camp of natives, but we could not prevail upon any of them to stop and hold parley with us. Four hours' travelling over rather rocky ground led us well into the range, which we found to consist of granite, capped with metamorphic sandstones and broken up by dykes of variegated jasper. In a deep ravine at the foot of a cliff we found a small pool of beautiful clear spring water, which was very acceptable, as the sun had now acquired considerable power, and the grasses were beginning to get very dry food for our horses. During the halt at this spring Mr. Harding and myself ascended the highest part of the range, which was found to be 500 or 600 feet above the plain. From this elevation I was enabled to select our onward route, and obtain bearings to several useful summits for triangulation--a few hills to the south-south-east being visible at the distance of sixty or seventy miles, which no doubt form part of the continuation of the Hamersley Range. Resuming an east course, the culminating point of the range was soon passed, when we descended to the eastward down some deep and remarkably picturesque rocky glens, in which were found several springs and pools of water, leading down to a fine grassy flat, in which were growing some fine large flooded-gum trees. Camp 61. 18th August (Sunday). Found our latitude 21 degrees 36 minutes 8 seconds; longitude 119 degrees 13 minutes east by account. THE STRELLEY RIVER. 19th August. The country being very hilly, it was found best to follow down the stream upon which we had encamped, although it trended to the north of east. In a few miles the valley opened out with fine pools of permanent water, covered with numerous flights of ducks, and at eight miles it joined a wide valley from the south, down which flowed a river, divided into several channels, containing many fine pools from 50 to 200 yards wide, which were still running gently from one to another. The banks, although well grassed, were very rocky, rendering travelling excessively fatiguing to our heavily-loaded pack-horses, several of them being bruised and strained while jumping from rock to rock, the clefts being too deep and narrow for them to walk between, and the ranges bordering the valley were too steep to admit of our leaving the river, which we were compelled to follow down to latitude 21 degrees 26 minutes 52 seconds. Camp 62. 20th August.