the mass of vegetation. The sand-bank, which lies at the upper end of the island extends several miles, and presents an irregular, and in some parts, strongly waved surface, with deep hollows and ridges. When upon it, one feels as though treading an almost boundless field of sand: for towards the south-east, where no forest-line terminates the view, the white, rolling plain stretches away to the horizon. The north-easterly channel of the river lying between the sands and the further shore of the river is at least two miles in breadth; the middle one, between the two islands, Shimuní and Bariá, is not much less than a mile.
We found the two sentinels lodged in a corner of the praia, where it commences at the foot of the towering forest-wall of the island; having built for themselves a little rancho with poles and palm-leaves. Great precautions are obliged to be taken to avoid disturbing the sensitive turtles, who, previous to crawling ashore to lay, assemble in great shoals off the sand-bank. The men, during this time, take care not to show themselves and warn off any fisherman who wishes to pass near the place. Their fires are made in a deep hollow near the borders of the forest, so that the smoke may not be visible. The passage of a boat through the shallow waters where the animals are congregated, or the sight of a man or a fire on the sand-bank, would prevent the turtles from leaving the water that night to lay their eggs, and if the causes of alarm were repeated once or twice, they would forsake the praia for some other quieter place. Soon after we arrived, our men were sent with the net to catch a supply of fish for supper. In half an hour,
