There was so much fallen timber in the Nammoy, and its waters were so low, that the portable boats could not be used on that river with advantage, and I proceeded by land in a north-west direction, until convinced by its course turning more to the westward that this river joined the river Darling.  I therefore quitted its banks with the intention of exploring the country further northward, by moving round the western extremities of the mountains mentioned in my former letter, and which I have since distinguished in my map by the name of the Lindesay Range.  These mountains terminate abruptly on the west, and I entered a fine open country at their base, from whence plains (or rather open ground of gentle undulation) extended westward as far as could be seen.  On turning these mountains I directed my course northward, and to the eastward of north, into the country beyond them, in search of the river KINDUR; and I reached a river flowing westward, the bed of which was deep, broad, and permanent, but in which there was not then much water.

The river Karaula.

The marks of inundation on trees, and on the adjoining high ground, proved that its floods rose to an extraordinary height; and from the latitude, and also from the general direction of its course, I considered this to be the river which Mr. Cunningham named the Gwydir, on crossing it sixty miles higher, on his route to Moreton Bay.  I descended this river, and explored the country on its left bank for about eighty miles to the westward, when I found that its general course was somewhat to the southward of west.  This river received no addition from the mountains over that part of its left bank traversed by me; and the heat being intense, the stream was at length so reduced that I could step across it.  The banks had become low, and the bed much contracted, being no longer gravelly, but muddy.  I therefore crossed this river and travelled northward, on a meridian line, until, in the latitude of 29 degrees 2 minutes, I came upon the largest river I had yet seen.  The banks were earthy and broken, the soil being loose, and the water of a white muddy colour.  Trees, washed out by the roots from the soft soil, filled the bed of this river in many places.  There was abundance of cod-fish of a small size, as well as of the two other kinds of fish which we had caught in the Peel, the Nammoy, and the Gwydir.  The name of this river, as well as we could make it out from the natives, was Karaula.  Having made fast one tree to top of another tall tree, I obtained a view of the horizon, which appeared perfectly level, and I was in hopes that we had at length found a river which would flow to the northward and avoid the Darling.  I accordingly ordered the boat to be put together, and sent Mr. White with a party some miles down to clear away any trees in the way.  Mr. White came upon a rocky fall, and found besides the channel so much obstructed by trees, and the course so tortuous,