June 29.--As we proceeded down the river, the country gradually became much lower in its immediate vicinity; and between four and five miles from our resting-place it was even with the banks, and in some places overflowed them. All travelling near the river with horses was at once interrupted, and this was the more perplexing as it rendered the communication with the boats uncertain, and liable to be cut off altogether. Finding that those marshes were only impassable for a mile or little more from the river, and that occasionally we could approach within one hundred yards of it, the horses were directed to keep round the edge of them, making for the river whenever practicable, and firing guns to let the boats know our situation. At two o'clock in the after. noon we stopped, after going about ten miles and a half, about one hundred and fifty yards from the river. which we could not approach nearer by reason of wet and boggy marshes; in fact, the place where we stopped is of the same description, but now (fortunately for us) dry. The country north-east of us, along the dry edge of which we were obliged to keep, is as bad as possible, being in wet seasons full of water-holes, and consequently impassable. The river still continues undiminished, as we find that the branches and small streams that frequently run from it join it again at short distances, and that they owe their existence at this time to the full state of the river, which is certainly some feet above its usual level. The breadth and depth of the river were various throughout the day: in the places where it overflowed its banks, there was not more than from ten to twelve feet; in others, where it ran very broad, but was confined within them, fifteen feet; and in narrower places, under the same circumstances, upwards of twenty feet. Thus it seemed to vary with the capacity of the channel to contain its waters, which were very muddy, the current running at a medium rate of a mile per hour. The boats arrived at about half past four o'clock, meeting nothing to interrupt them.