As the reader will have understood, I wrote, in the year 1843, to Lord Stanley, the then colonial minister, volunteering my services to conduct an expedition into Central Australia.  It appeared to his Lordship as well as to Sir John Barrow, to whom Lord Stanley referred my report, that the plan I had proposed was too extensive, and it was therefore determined to adopt a more modified one, and to limit the resources of the expedition and the objects it was to keep in view, to a certain time, and to the investigation of certain facts.  After expressing his opinion as to the magnitude of the undertaking I had contemplated, “There is, however,” says Sir J. Barrow, in a minute to the Secretary of State, “a portion of the continent of Australia, to which he (Captain Sturt) adverts, that may be accomplished, and in a reasonable time and at a moderate expense.

“He says, if a line be drawn from lat. 29 degrees 30 minutes and long. 146 degrees, N.W., and another from Mount Arden due north, they will meet a little to the northward of the tropic, and there, I will be bound to say, a fine country will be discovered.  On what data he pledges himself to the discovery of this fine country is not stated.  It may, however, be advisable to allow Mr. Sturt to realize the state of this fine country.

“This, however, is not to be done by pursuing the line of the Darling to the latitude of Moreton Bay, which would lead him not far from the eastern coast, where there is nothing of interest to be discovered, nor does it appear advisable to pursue the Darling to the point to which he and Major Mitchell have already been, for this reason.  His preparations will, no doubt, be made at Adelaide; from thence to the point in question is about 600 miles, and from this point to the fine country, a little beyond the tropic, is 700 miles, which together make a journey of 1300 miles.  Now a line directly north from Adelaide, through Mount Arden, to the point where it crosses the former in the fine country, is only 800 miles, making a saving, therefore, of 500 miles, which is of no little importance in such a country as Australia.

“But Mr. Sturt assigns reasons for supposing that a range of mountains will be found about the 29th parallel of latitude, and Mr. Eyre, whilst exploring the Lake he discovered to the northward of the Gulf of St. Vincent, Adelaide, notices mountains to the N.E., in about the latitude of 28 degrees.  Supposing, then, a range of mountains to exist about that parallel, their direction will probably be found to run from N.E. to S.W., which is that generally of the river Darling and its branches; and in this case it may reasonably be concluded that these mountains form the division of the waters, and that all the branches of the several rivers (some of them of considerable magnitude) which have been known to fall into the bays and gulfs on the W. and N.W. coasts, between the parallels of 14 degrees and 21 degrees, have their sources on the northern side of this range of mountains; but, even if no such range exists, it is pretty evident, from what we know of the southern rivers, adjuncts chiefly of the Darling, that somewhere about the latitudes of 28 degrees or 29 degrees the surface rises to a sufficient height to cause a division of the waters, those on the northern side taking a northerly direction, and those on the southern side a southerly one.