During my rambles in this neighbourhood, I found several species of plants which I had not previously met with. In a small stream of beautifully clear water the curious _Cabomba aquatica_, Aubl., grows abundantly, which to the Botanist is a most interesting plant, as, both in habit and structure, it forms a transition link between the _Ranunculus_ family and that of the water lilies. In the same stream I likewise collected specimens of a _Marsilæa_, a pale blue flowered _Pontederia_, and a large white flowered _Nymphæa_ different from that which grows in the lake at Olinda. In brackish water a little above Maceio, a _Potamogeton_ grows in vast quantities, which on comparison, does not seem to differ from the British _P. pectinatus_. We returned to Maceio by daylight, and I observed that the shores abound with Mangroves, principally _Rhizophora Mangle_, which reaches here to a much greater size than I have elsewhere seen it, some of the trees being, at least, thirty feet high, with stems proportionally thick; it presents a curious appearance, the large roots supporting the stems at the height of several feet above the water, and curving outwards and downwards; if the real top were not seen, we could almost fancy that the tree had been reversed; the long pendent radicles of the seeds are also remarkable, as they are thrown down to the ground while the fruit is yet attached to the parent plant. The wood of this tree is very much used as fuel, it burns extremely well in the green state; at Maranham little else is used for this purpose.