June 24.--The horses having strayed a little this morning, and given us some trouble to get them, it was rather late when we started; we, however, crossed the low ridges at the head of the Light, and entering upon extensive plains to the north, we descended to a channel, which I took to be the head of a watercourse called the "Gilbert." Finding here some tolerably good water and abundance of grass, I halted the party for the night, though we were almost wholly without firewood, an inconvenience that we felt considerably, as the nights now were very cold and frosty. Our stage had been fourteen miles to-day, running at first over low barren ridges, and then crossing rich plains of a loose brown soil, but very heavy for the drays to travel over. At our camp, a steep bank of the watercourse presented an extensive geological section, but there was nothing remarkable in it, the substrata consisting only of a kind of pipe clay. June 25.--Upon starting this morning we traversed a succession of fine open and very grassy plains, from which we ascended the low ridges forming the division of the waters to the north and south. In the latter direction, we had left the heads of the "Gilbert" and "Wakefield" chains of ponds, whilst in descending in the former we came upon the "Hill," a fine chain of ponds taking its course through a very extensive and grassy valley, but with little timber of any kind growing near it. On this account I crossed it, and passing on a little farther encamped the party on a branch of the "Hutt," and within a mile and a half of the main course of that chain of ponds. Our whole route to-day, had been through a fine and valuable grazing district, with grass of an excellent description, and of great luxuriance. We were now nearly opposite to the most northerly of the out stations, and after seeing the party encamp, I proceeded, accompanied by Mr. Scott, to search for the stations for the purpose of saying good bye to a few more of my friends. We had not long, however, left the encampment when it began to rain and drove us back to the tents, effectually defeating the object with which we had commenced our walk. Heavy rain was apparently falling to the westward of us, and the night set in dark and lowering. In some parts of the large plains we had crossed in the morning, I had observed traces of the remains of timber, of a larger growth than any now found in the same vicinity, and even in places where none at present exists. Can these plains of such very great extent, and now so open and exposed, have been once clothed with timber? and if so, by what cause, or process, have they been so completely denuded, as not to leave a single tree within a range of many miles? In my various wanderings in Australia, I have frequently met with very similar appearances; and somewhat analogous to these, are the singular little grassy openings, or plains, which are constantly met with in the midst of the densest Eucalyptus scrub.