Plains of stiff clay. The Wimmera. Difficult passage of its five branches. Ascend Mount Zero. Circular lake, brackish water. The Wimmera in a united channel. Lose this river. Ascend Mount Arapiles. Mr. Stapylton's excursion northward. Salt lakes. Green Hill lake. Mitre lake. Relinquish the pursuit of the Wimmera. The party travels to the south-west. Red lake. Small lakes of fresh water. White lake. Basketwork of the natives. Muddy state of the surface. Mr. Stapylton's ride southward. Disastrous encounter of one man with a native. A tribe makes its appearance. More lakes of brackish water. Escape at last from the mud. Encamp on a running stream. Fine country. Discovery of a good river. Granitic soil. Passage of the Glenelg. Country well watered. Pigeon ponds. Soft soil again impedes the party. Halt to repair the carts and harness. Natives very shy. Chetwynd rivulet. Slow progress over the soft surface. Excursion into the country before us. Beautiful region discovered. The party extricated with difficulty from the mud. PLAINS OF STIFF CLAY. July 17. The ground on the sides of the low hills was still so soft (and in this respect I had found the country we had lately crossed even worse than that previously traversed by the carts) that the only prospect which remained to us of being able to continue the journey was by proceeding over the plains extending along the interior side of the Grampians of the South. The soil of such plains consisted chiefly of clay, and we had recently found that it bore the wheels of the waggons much better during the winter season than the thin and loose soil on the sides of hills; apparently because this lay on rock, or a substratum so tenacious as to support the water in or just under the surface. The wheels and also the feet of the cattle sunk at once to this rocky subsoil whatever its depth, and up came the water, so that on level parts our track resembled a ditch of mud and water, and on slopes it formed a current of water and a drain from the sides of hills. I had observed the plains during my reconnaissance of the interior from the side of Mount William, and I now directed our course towards them. We crossed without difficulty the little river by the passage Mr. Stapylton had prepared during my absence and, after travelling about four miles first west and then north-west, we came upon an extensive plain. The soil consisted of good strong clay on which the cattle travelled very well, and it was covered with the best kind of grass. On reaching it I resumed my former course which was nearly west-south-west towards Mount Zero, a name I applied to a remarkable cone at the western extremity of the chain of mountains. After travelling 2 1/2 miles over the plain we again reached the banks of Richardson's creek, and forded it after some delay and considerable difficulty on account of the softness of the bottom. We next entered on a tract of grassy forest land, the trees being chiefly box and casuarinae. At 2 1/2