We found that the slave-dealers and most of their followers had already taken their departure--probably to avoid rendering us any assistance. They had only come down to the coast to embark their captives, and had gone back again, my companion supposed, to obtain a fresh supply. We found, however, about a dozen men, who came out when Senhor Silva called them in their own language. When he assured them that we were friends, and that we would treat them honestly, they agreed, without hesitation, to act as our bearers as far as the Crystal Mountains. Beyond them they declined going, saying that they had enemies on the other side who would certainly, if they found them, kill them, or carry them off as slaves, or, they added, "very likely eat us, for they are terrible cannibals." As soon as the arrangement was made, they all came leaping and hooting and rushing against each other, like a set of school-boys unexpectedly let loose for a half holiday, or a party of sailors on shore after a long cruise. While the blacks were arranging our property into fit packages for carrying, the two boys and I accompanied David to the mouth of the river, which, as I said, was lined with mangrove bushes, a ledge of rocks which ran out some way enabling us to get a view up the stream. We had thus an opportunity of examining those curious trees. Innumerable roots rose out of the water, lifting the trunk far above it, and from its upper part shot off numerous branches with bright green foliage, which grew in radiated tufts at their ends. Many of them were bespangled with large gaily-coloured flowers, giving them a far more attractive appearance than could be supposed, considering the dark, slimy mud out of which they grew. From the branches and trunk, again, hung down numberless pendulous roots, which had struck into the ground, of all thicknesses--some mere thin ropes, others the size of a man's leg--thus appearing as if the tree was supported by artificial poles stuck into the ground. David told me that the seeds germinate on the branches, when, having gained a considerable length, they fall down into the soft mud, burying themselves by means of their sharp points, and soon taking root, spring upwards again towards the parent tree. Thus the mangrove forms an almost impenetrable barrier along the banks of the rivers. On the other side of the stream, indeed, we saw that they had advanced a considerable distance into the ocean, their mighty roots being able to stem even the waves of the Atlantic. Near where we stood the ground was rather more open, and we saw the black mud covered with numberless marine animals, sea-urchins, _holothuria_, or sea-slugs, crabs, and several other creatures, many of brilliant hues, which contrasted curiously with the dark mud over which they were crawling. The roots of the trees were also covered with mussels, oysters, and other Crustacea. But the most curious creature was a small fish which I