Having made a circuit of the shores, he perceived on the westerly side--that next the island--a break in the cliff; and on a narrow examination he discovered an outlet.
It appeared to him that the lake at one time had emptied its waters through this ancient water-course.

The descent here was not only gradual, but the old river-bed was tolerably free from obstructions, especially of the vegetable kind.
He made his way rapidly downward, and in half an hour reached marshy ground.

The cane-brake now lay before him.

On his left he saw the sea on the south, about a third of a mile.

He knew that to the right must be the sea on the north, about half a mile or so.