ridges of drift-sand which encumbered the plains must in the first instance, have been brought from the interior by water, and then have been blown by the strong prevailing south-east winds across the country in a direction at least 50 degrees from that which they originally came from; this, with the clean water-worn appearance of the sand, the bold outlines of the hills seen to the far east, and the number of native fires observed in the same direction, must all tend to support the hypothesis that the western half of Australia is probably drained by a large river in about this meridian.  I could not, therefore, help regretting more than ever that we should be driven back at such an interesting spot; but mature reflection convinced me that any further attempt with our present means, at this period of the year, was almost certain to be attended with the most disastrous results; I therefore decided upon adopting the only other useful course open to us—­that of examining down to the sea the rivers already discovered.  With this in view, we to-day fell back five or six miles across the ranges to a tributary to the Oakover, called the Davis, when one of the horses became so crippled by a strain in the loins that we were obliged to halt to give him a chance of recovery, affording me leisure to verify our position by observing another set of lunar distances, which I found to agree well with those formerly taken ten miles to the westward.  Camp 78.

Down the Oakover river.

12th September.

We commenced the descent of the Davis, having much difficulty in getting along the sick horse, as it required the united strength of the party to lift him on his legs every time he fell, which he at last did so frequently that I ordered him to be shot, as it was hopeless to attempt to bring him on, and if left, he must have died of starvation.  By 2.0 p.m. we reached the junction of the stream we were upon with the Oakover, and halted two miles south of Camp 72; most of the party being now dismounted, shoe-leather was beginning to get very scarce with us.  Camp 79.

13th September.

This day we only travelled eight miles down the Oakover, and encamped near a deep creek, in which was caught a good haul of fish.  Camp 80.

14th September.

The feed was so good on this river that we were able to proceed to-day to latitude 20 degrees 59 minutes 33 seconds; the country improving much, grassy flats extending for some miles to the northward, the channel of the river being augmented by the junction of the large tributary crossed on our eastward track on the afternoon of the 29th August.  Camp 81.

15th September (Sunday).

Remained in camp to rest the horses.  A few natives were seen near the camp during the day.

16th September.

After running four or five miles further north, the Oakover turned to the north-west for fourteen miles, having a clear sandy or stony bed from 150 to 200 yards wide, water and grass being plentiful, and the country generally being open forest, with a pleasing appearance.  Camp 82.