The curious fact of some rock-holes being full, whilst others a few miles off are empty, again exemplifies the very local character of such rain as visits these parts.  The “Deep rock-holes,” as we called them (in lat. 24 degrees 20 minutes, long. 127 degrees 20 minutes), are peculiar, for one is perfectly cylindrical, two feet six inches in diameter going down vertically to a depth of twenty feet; the other goes down straight for six feet, and then shelves away under the rock to a depth of at least twelve feet.  It will be seen from our last few days’ experience, and from that of the few days soon to follow, that in this region rock-holes are numerous.  They are invariably situated on low surface outcrops of ’desert sandstone, surrounded by mulga and grass; beyond that, sand.  I take it that they have been formed in the same way as the granite rock-holes in the south of the Colony—­that is, by decay; that the whole country has been covered by a deposit of sand, borne by the winds, filling in former valleys and hollows, leaving only occasional patches of rock still visible.  Their frequent occurrence would then be accounted for by the fact that the deposit of sand is shallower here than elsewhere.  That it is so is pretty evident, for here the sand-ridges are much lower than further North, and still further South they disappear.  Low cliffs are seen, and when the latitude of Forrest’s route is reached, sandstone hills are numerous and rock-holes abundant.  In the course of ages perhaps the sand will again be shifted until such reservoirs as the “Deep rock-holes” are filled in and hidden, or partially covered and converted by the natives into wells.  Supposing a layer of sand to a depth of five or six feet could be thrown over the valley in which the Deep rock-holes are situated, the holes would at once be transformed into “Native Wells,” the term “well” being a misnomer, and apt to suggest a copious supply to any unacquainted with the interior.  I suppose that to the uninitiated no map is so misleading as that of West Australia, where lakes are salt-bogs without surface water, springs seldom run, and native “wells” are merely tiny holes in the rock, yielding from 0 to 200 gallons!

From our position at the rock-holes, by skirting, possibly without sighting, the end of the Rawlinson Range and steering nearly due South-West, we should hit off Woodhouse Lagoon of our upgoing journey.  For simplicity in steering I chose a due South-West course, which should take us a few miles to the East of the lagoon, two hundred miles distant in a bee-line.  I was anxious to see what water it held, and check my work by re-crossing our track of the previous year; and besides this, the lagoon lay on our most direct course for the nearest settlements, still 450 miles away on the chart.

Whilst resting at the rock-holes I took the opportunity of giving Bluey a lesson in manners, much to the entertainment of my companions.