July 31.—­Having remained all day in camp to rest the party, I found that the horses had again made a great diminution in the depth of the water in the rock, I therefore had the drays all prepared in the evening, intending to move away to the other water-course in the morning; but the next day the horses had unfortunately strayed, and it was late before they were brought up, so that we could not get away.  Upon watering them when they arrived, I found that less impression was made upon the water than on the previous days; and after an anxious consultation with my overseer, I decided upon leaving the party in camp at Depot Pool until I could reconnoitre further north and return.

August 1.—­To prevent any difficulties during my absence, in the event of the water failing in the rocky hole, I sent the native boy to shew the overseer the place where the permanent water was, and gave him instructions to move the party thither if he should find it necessary; but not until their safety absolutely required it, or before he had fully ascertained that no water was to be procured by digging in the bed of any of the adjoining watercourses.  During his absence, I employed myself busily in getting ready for another push to the north with the native boy to search for a new depot, as in a country so difficult and embarrassing, it was quite impracticable to move on the party until after having previously ascertained where they could be taken to with safety.  Upon examining the barometers to-day, I was much concerned to find that they were both out of order and useless; the damp had softened the glue fastening the bags of leather which hold the quicksilver, and the leathers that were glued over the joints of the cisterns, and so much of the mercury had escaped, before I was aware of it, that I found all the previous observations valueless.  I emptied the tubes and attempted to refill them, but in so doing I unfortunately broke one of them, and the other I could not get repaired in a satisfactory manner, not being able, after all my efforts, to get rid of some small air bubbles that would intrude, in spite of every care I could exercise.

August 2.—­Leaving early, I took with me a native boy, and a man on horseback, leading a pack-horse, to carry water, as I could not but be apprehensive, lest we might find none in the country into which we were advancing.  In following down the Depot watercourse to the plains, we found a fire where the natives had encamped the previous night.  This surprised us, because we were not aware that there were any so immediately in our vicinity.  It however shewed us the necessity of vigilance and circumspection in our future movements.