he base of the hill, the
summit of which was reached at 12.25 p.m.; from this position the flat or
marsh appeared to extend fifteen miles to the north-east, a branch also
to the north-west, in which direction the water seemed to trend, though
the dip of the country, if any, was so slight as to render it uncertain.
To the north a range of trap hills, five to ten miles distant,
intercepted the view. Having completed observations at 2.10, steered 300
degrees along the foot of a range of trap hills; at 3.50 passed a dry
salt lake on our right, and at 5.15 bivouacked on the side of a trap
hill, among some fine oat-grass growing on calcareous tufa. From the
summit of the hill we could see salt marshes continuing in a north-west
direction for many miles; all the hills within twenty miles were of a
trap formation, and therefore gave no prospect of obtaining water, the
soil being loose and the rock full of fissures; hitherto we seldom had
found water except on or near granite rocks, which serve to collect the
rainwater of even slight showers.

Latitude 28 degrees 24 minutes 20 seconds; longitude 116 degrees 42
minutes.

SCARCITY OF WATER. TURN TO THE WEST.

4th September.

As the horses had been twenty-four hours without water, and there was no
prospect of obtaining any to the north or west, no rain having fallen for
the past month, it was deemed advisable to return to the last bivouac,
and then, by a westerly course, attempt to make the sources of the Hutt
or Arrowsmith rivers, the mouths of which had been discovered by Captain
Grey on the coast opposite our position. Accordingly, after six hours'
ride, we got back to the well at the bivouac of the 2nd.

5th September.

At 7.50 a.m. left the bivouac, and, steering 240 degrees, at 8.15 crossed
the dry watercourse trending west; at 11.0 ascended the ridge bounding
the valley; at noon found a small pool of water in a gully descending to
the westward; after this traversed a continuous thicket of acacia with
narrow strips of cypress forest, and bivouacked at 5.50 without water.

Latitude 29 degrees 47 minutes 15 seconds; longitude 116 degrees 41
minutes.

6th September.

At 6.45 a.m., proceeding west, ascended a granite hill, near the top of
which we found a native well, where we halted at 7.30. Having watered the
horses and breakfasted, at 9.30 resumed our journey over granite hills,
covered with brushwood and cypress with a few grassy patches; at 11.10
passed a native