Tuesday, 5th June, Gum-Tree Plain. Started on the same course at 7 o'clock for the high peak, through the same sort of country as yesterday. No watercourse. At fifteen miles ascended the peak, which I have named Mount Samuel, after my brother. The top is a mass of nearly pure ironstone. It attracted the compass 160 degrees. From north to west are broken ranges and isolated hills of a volcanic character, in all sorts of shapes. The isolated hills seem to be the termination of these ranges, which run nearly north and south. I have named them the McDouall Ranges, after Colonel McDouall, of the 2nd Life Guards, Logan, Wigtownshire. I then changed my course to the north-north-east in search of water, there being no appearance of any to the north-north-west. After travelling five miles over small grassy, scrubby plains, between isolated hills and gum-trees, I could not find a water-course, so I changed to the east, to try if I could see anything from a high hill, which I ascended, and discovered a gum creek coming from the range on the east side. Followed it down, and, one mile and a half from the top, found a splendid hole of water in the rock, very deep, and permanent. The creek is very rocky, and its course here is north-east into the plain. Wind south-east. Clouds from the north-west.