I set off, accompanied by my black guide mounted, for the top of Marga, and we reached it this time by a route in which the native displayed the usual skill of his race. Certainly I never ascended a hill of more perplexing features, all these heights being also of extremely difficult access, very steep and extending in the direction of 10 and 12 degrees East of North. They consist of the sharp edges of inclined strata of hard purple-coloured clay-slate. I was however rewarded for the fatigues this hill had cost me, on two different days, not with a fine view, for the summit was too woody for that, but with a sight of some important points determined during my late journey; and others which I had then observed only from the Canobolas but which I was now enabled to fix by angles observed from this station. The most important point visible besides the Canobolas was Mount Lachlan, by means of which I determined the true situation of Marga and the neighbouring hill Nangar; which is rather higher but more wooded, and 2 1/2 miles distant towards the south-east. These two form the summits of an isolated mountain mass on the left bank of Byrne's creek, the top of Marga being about 1000 feet above our camp on its banks. I drew outlines (according to my usual custom) of all the hills on the horizon before us, and took angles on them with the theodolite. Descending by a shorter route I reached the camp in time to protract my angles, whereby I ascertained to my great satisfaction that both Marga and Nangar had been truly fixed from the Canobolas, as well as other points observed in my former journey, the accuracy of which, by a good angle with Mount Lachlan, I was thus enabled to prove without going out of my way, besides establishing there a good base for extending the survey southward. March 24. Our guide was now joined by some older natives, and one of them had been examining the country ahead, being anxious about the safe passage of our carts. His reconnaissance had not been made in vain, for he led us to an easy, open pass through a range of which we had heard much from stockmen as likely to trouble us because, as they said, its rocky extremities overhung the creek. We crossed it with ease however, guided by the native. It consisted of granite and evidently belonged geologically to the ridge traversed by us on the second day after leaving Buree during our last journey. On the range, green pine trees (callitris) and a luxuriant crop of grass covering the adjacent country, multitudes of fat cattle were to be seen on all sides. I had heard that, after crossing the burnt up surface of the colony, I should see green pastures here, beyond its limits. CROSS BYRNE'S CREEK.