This day of rest was alike acceptable to man and horse, and afforded me an opportunity, after reading prayers to the party, to clear a set of lunar distances, by which I found that the chronometer would have placed us forty miles to the west of our true position. I had long since observed that it could not be trusted under even ordinary variations of temperature, but could procure no other, the Acting Surveyor-General having declined to supply me with either of the two chronometers belonging to his department that could be relied on, and in consequence I now found I should be compelled to have recourse entirely to lunar observations and triangulation for the compilation of the maps, which would add very much to the amount of labour and liability to error. Several crested pigeons, white cockatoos, and crested quail or partridges, were shot as they came to drink at the waterhole. METAMORPHIC ROCKS. 17th June. The horses had so far recovered after the day's rest that we were enabled to resume a south-west course, following down the bed of the stream to latitude 22 degrees 51 minutes, the country slightly improving towards evening; but we again had to encamp without water, having, however, obtained a small quantity in some gravel at noon. The hills to the east of our track rose about 1000 feet above the bed of the watercourse, and consisted of metamorphic sandstones and shales, intersected by whinstone dykes, their summits being capped with red conglomerate. In one place the river had cut through a ridge of altered rocks, and exhibited a very singular contortion of the strata, the laminae being crippled up into an arch of 100 feet high, showing a dip on each flank of 45 degrees, forming a cave beneath running for some distance into the hill. Camp 23. 18th June. Continuing to follow the stream-bed south-west for eight or nine miles, we came upon a patch of very green grass, on which we halted, to allow the horses the benefit, on account of their not having had any water since noon yesterday. In the meanwhile, accompanied by Mr. Brown, I started off and walked to a prominent hill six miles to the south, to get a view of the surrounding country. From the summit of this hill, which we found to have an elevation of 700 or 800 feet, we procured a valuable round of bearings, and had a distant view of the country to the southward. Level plains and detached ranges of moderate elevation appeared to be the general character of the country towards the Lyons River. We returned to the party by 3.0 p.m., and were glad to find that during our absence water had been found in shallow clay-pans a mile to the westward, to which we moved over and encamped. Camp 24. Latitude 22 degrees 56 minutes 23 seconds; longitude by account 117 degrees 21 minutes. 19th June.