We soon after entered another extensive plain on which the rich soil, when we had got halfway across, changed to a stiff clay, the grass marking the change by a difference of colour, being red on the clay and quite green on the other soil. This clay occupied the highest part of the plain. Passing through another scrub of Acacia pendula we reached a still more extensive plain, and while we were crossing it I was informed, by the carpenter, that the wheels of one of the carts were falling to pieces and required immediate repair. We accordingly halted, and some wedges were driven into them. The thermometer here stood at 97 degrees. AGAIN OBLIGED TO CUT OUR WAY. A brush of Acacia pendula also bounded this plain on the north; and beyond it we entered a scrub of forest-oak (casuarina) which was so very thick that we were compelled to halt the carts until a way could be cut through it for upwards of two miles; beyond that distance however the brush opened into patches of clearer ground. We had changed our course to north in the large plain, and had preserved this direction in cutting through these scrubs. It was now four P.M., and during the whole journey from six A.M., we had seen no water; the day also was exceedingly warm, and I was riding in advance of the party, and looking at some elevated ground in an opening of the wood with thoughts of encamping there, but very doubtful whether we should ever see water again. FORTUNATE DISCOVERY OF WATER. When almost in despair I observed a small hollow with an unusually large gumtree hanging over it; and my delight under such circumstances may be imagined, when I perceived on going forward, the goodly white trunk of the tree reflected in a large pond. A grassy flat beside the water proved quite a home to us, affording food for our cattle, and rest from the fatigues of that laborious day. We found these ponds in situations which seemed rather elevated above the adjacent plains, at least their immediate banks were higher; hence we usually came upon them where we least expected to see water, before we were acquainted with this peculiarity of the country. The pond where we now encamped was connected with several others that were dry, but it was quite impossible at that time to discover which way the current ran in times of flood. The latitude was 30 degrees 6 minutes 30 seconds South. In the evening the sky was illuminated so much by an extensive fire in the woods near us that the light was clearer in our camp than the brightest moonlight. DRY VALLEYS. January 4.