Leave for Mount Olga. Change of scene. Desert oak-trees. The Mann range. Fraser's Wells. Mount Olga's foot. Gosse's expedition. Marvellous mountain. Running water. Black and gold butterflies. Rocky bath. Ayers' Rock. Appearance of Mount Olga. Irritans camp. Sugar-loaf Hill. Collect plants. Peaches. A patch of better country. A new creek and glen. Heat and cold. A pellucid pond. Zoe's Glen. Christy Bagot's Creek. Stewed ducks. A lake. Hector's Springs and Pass. Lake Wilson. Stevenson's Creek. Milk thistles. Beautiful amphitheatre. A carpet of verdure. Green swamp. Smell of camels. How I found Livingstone. Gabriel Daniel Fahrenheit. Cotton and salt bush flats. The Champ de Mars. Sheets of water. Peculiar tree. Pleasing scene. Harriet's Springs. Water in grass. Ants and burrs. Mount Aloysius. Across the border. The Bell Rock. We left this pretty glen with its purling stream and reedy bed, and entered very shortly upon an entirely different country, covered with porcupine grass. We went north-west to some ridges at seventeen miles, where there was excellent vegetation, but no water. I noticed to-day for the first time upon this expedition some of the desert oak trees (Casuarina Decaisneana). Nine miles farther we reached a round hill, from which Mount Olga bore north. We were still a considerable distance away, and as I did not know of any water existing at Mount Olga, I was anxious to find some, for the horses had none where we encamped last night. From this hill I could also see that the Musgrave chain still ran on to the west; though broken and parted in masses, it rose again into high mounts and points. This continuation is called the Mann Range. Near the foot of the round hill I saw a small flat piece of rock, barely perceptible among the grass; on it was an old native fireplace and a few dead sticks. On inspection there proved to be two fine little holes or basins in the solid rock, with ample water for all my horses. Scrub and triodia existed in the neighbourhood, and the feed was very poor. These were called Fraser's Wells. Mount Olga was still fifty miles away. We now pushed on for it over some stony and some scrubby country, and had to camp without water and with wretched feed for the horses. Casuarina trees were often passed. We generally managed to get away early from a bad camp, and by the middle of the next day we arrived at the foot of Mount Olga. Here I perceived the marks of a wagon and horses, and camel tracks; these I knew at once to be those of Gosse's expedition. Gosse had come down south through the regions, and to the watering places which I discovered in my former journey. He had evidently gone south to the Mann range, and I expected soon to overtake him. I had now travelled four hundred miles to reach this mount, which, when I first saw it, was only seventy-five or eighty miles distant.