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.