the night.  We rested our horses here to-day to allow them to fill themselves with food, as no doubt they will require all the support they can get to sustain them in their work before we reach the distant mountain.  We passed the day in enlarging the tank, and were glad to find that, though no increase in the supply of water was observable, still there seemed no diminution, as now a horse could fill himself at one spell.  We took a stroll up into the rocks and gullies of the ridges, and found a Troglodytes’ cave ornamented with the choicest specimens of aboriginal art.  The rude figures of snakes were the principal objects, but hands, and devices for shields were also conspicuous.  One hieroglyph was most striking; it consisted of two Roman numerals—­a V and an I, placed together and representing the figure VI; they were both daubed over with spots, and were painted with red ochre.  Several large rock-holes were seen, but they had all long lain dry.  A few cypress pines grew upon the rocks in several places.  The day was decidedly hot; the thermometer stood at 100 degrees in the shade at three o’clock, and we had to fix up a cloth for an awning to get sufficient shade to sit under.  Our only intellectual occupation was the study of a small map of Australia, showing the routes of the Australian explorers.  How often we noted the facility with which other and more fortunate travellers dropped upon fine creeks and large rivers.  We could only envy them their good fortune, and hope the future had some prizes in store for us also.  The next morning, after taking three hours to water our horses, we started on the bearing of the high mount, which could not be seen from the low ground, the bearing being south 18 degrees west.  We got clear of the low hills of the glen, and almost immediately entered thick scrubs, varied by high sandhills, with casuarina and triodia on them.  At twelve miles I noticed the sandhills became denuded of timber, and on our right a small and apparently grassy plain was visible; I took these signs as a favourable indication of a change of country.  At three miles farther we had a white salt channel right in front of us, with some sheets of water in it; upon approaching I found it a perfect bog, and the water brine itself.  We went round this channel to the left, and at length found a place firm enough to cross.  We continued upon our course, and on ascending a high sandhill I found we had upon our right hand, and stretching away to the west, an enormous salt expanse, and it appeared as if we had hit exactly upon the eastern edge of it, at which we rejoiced greatly for a time.  Continuing on our course over treeless sandhills for a mile or two, we found we had not escaped this feature quite so easily, for it was now right in our road; it appeared, however, to be bounded by sandhills a little more to the left, eastwards; so we went in that direction, but at each succeeding mile we saw more and more of this objectionable feature; it continually