We followed the shores of the estuary to the northward and eastward until we saw a point where it appeared to separate into two branches. The natives decamped as soon as they observed us coming, and Kaiber, who watched them with the most intense interest, indulged in various speculations as to the number they would bring back when they returned. We joined the party and traced the shores of the estuary to its mouth, which turned out to be the opening we saw in the morning: this mouth is completely sheltered by a line of breakers and reefs, which, although they present a most formidable appearance from the sea, can be doubled by keeping pretty close along the shore in approaching the mouth of the river. Owing to this reef there are no breakers on the bar, but its mouth is very narrow and so shoal that I doubt if a boat could be got in at any other time than high water: some of the sailors with me however thought otherwise; but there is at all events convenient landing at this point under the shelter of the reef. FERTILE COUNTRY. April 2. The men not having quite completed their preparations for starting, I moved off at dawn to resume the survey of Gantheaume Bay and its vicinity. The estuary appeared this morning even more lovely than yesterday, and as the heavy morning mists arose, unfolding its beauties to our view, all those feelings came thrilling through my mind which explorers alone can know; flowering shrubs and trees, drooping foliage, a wide and placid expanse of water met the view; trickling springs and fertile flats were passed over by us; there was much barren land visible in the distance, though many a sign and token might lead the practical explorer to hope that he was about to enter upon a tract of an extent and fertility yet unknown in south-west Australia. A total change had taken place in the geological formation of the land: a rock as yet unobserved in the south-west portion of the continent occupied the principal place here; and with this rock was associated limestone; the springs had a strong sulphureous smell, and the lofty broken character of the distant mountains had an almost grand appearance to those who had so long wandered through low and level countries. Each step I took rendered my spirits more buoyant and elastic, and each hill, the position of which I fixed, gave me, from its appearance, renewed hopes. Under such agreeable circumstances the morning wore rapidly away, and, having rendered my survey as complete as I could, we returned to the boats. COMMENCE THE MARCH TO PERTH. PROVISIONS DIVIDED.