The wind at night changed to the south-west, and was very cold, chilling us almost as much as the previous heat had oppressed us.

These sudden and excessive changes in temperature induce great susceptibility in the system, and expose the traveller to frequent heats and chills that cannot be otherwise than injurious to the constitution.
January 7 .-- Having concealed some water, provisions, and the pack-saddle at the camp, I sent the man back with the pack-horse to encamp at the undulating plains, where nine gallons of water had been left for him and his horse, and the following day he was to rejoin the overseer at the sand hills.
To the latter I sent a note, requesting him to send two fresh horses to meet me at the plains on the 15th of January, for, from the weak condition of the animals we had with us, and from the almost total absence of grass for them, I could not but dread lest we might be obliged to abandon them too, and in this case, if we did not succeed in finding water, we should perhaps have great difficulty in returning ourselves.
As soon as the man was gone, we once more moved on to the north-west, through the same barren region of heavy sandy ridges, entirely destitute of grass or timber.

After travelling through this for ten miles, we came upon a native pathway, and following it under the hummocks of the coast for eight miles, lost it at some bare sand-drifts, close to the head of the Great Bight, where we had at last arrived, after our many former ineffectual attempts.
Following the general direction the native pathway had taken, we ascended the sand-drifts, and finding the recent tracks of natives, we followed them from one sand-hill to another, until we suddenly came upon four persons encamped by a hole dug for water in the sand.

We had so completely taken them by surprise, that they were a good deal alarmed, and seizing their spears, assumed an offensive attitude.

Finding that we did not wish to injure them, they became friendly in their manner, and offered us some fruit, of which they had a few quarts on a piece of bark.
This fruit grows upon a low brambly-looking bush, upon the sand-hills or in the flats, where the soil is of a saline nature.