At every turn of the river we discovered objects of great interest. The dense and nearly impenetrable forest itself occupied our chief attention; magnificent trees, altogether new to us, were anchored to the ground by bush-rope, convolvuli, and parasitical plants of every variety. The flowers of these cause the woods to appear as if hung with garlands. Pre-eminent above the others was the towering and majestic Mora, its trunk spread out into buttresses; on its top would be seen the king of the vultures expanding his immense wings to dry after the dews of night. The very peculiar and romantic cry of the bell-bird, or campanero, would be heard at intervals; it is white, about the size of a pigeon, with a leathery excrescence on its forehead, and the sound which it produces in the lone woods is like that of a convent-bell tolling. A crash of the reeds and brushwood on the river's bank would be followed by a tapir, the western elephant, coming down to drink and to roll himself in the mud; and the manati or river-cow would lift its black head and small piercing eye above the water to graze on the leaves of the coridore tree. They are shot from a stage fixed in the water, with branches of their favourite food hanging from it; one of twenty-two cwt. was killed not long ago. High up the river, where the alluvium of the estuary is changed for white sandstone, with occasionally black oxide of manganese, the fish are of delicious flavour; among others, the pacoo, near the Falls or Rapids, which is flat, twenty inches long, and weighs four pounds; it feeds on the seed of the _arum arborescens_, in devouring which the Indians shoot it with their arrows: of similar genus are the cartuback, waboory, and amah. The most remarkable fish of these rivers are, the _peri_ or _omah_, two feet long; its teeth and jaws are so strong, that it cracks the shells of most nuts to feed on their kernels, and is most voracious; the Indians say that it snaps off the breasts of women, and emasculates men. Also the genus _silurus_, the young of which swim in a shoal of one hundred and fifty over the head of the mother, who, on the approach of danger, opens her mouth, and thus saves her progeny; with the _loricaria calicthys_, or _assa_, which constructs a nest on the surface of pools from the blades of grass floating about, and in this deposits its spawn which is hatched by the sun. In the dry season this remarkable fish has been dug out of the ground, for it burrows in the rains owing to the strength and power of the spine; in the gill-fin and body it is covered with strong plates, and far below the surface finds moisture to keep it alive. The _electric eel_ is also an inhabitant of these waters, and has sometimes nearly proved fatal to the strongest swimmer. If sent to England in tubs, the wood and iron act as conductors, and keep the fish in a continued state of exhaustion, causing, eventually, death: an earthenware jar is the vessel in which to keep it in health.