She could make sixteen knots when driven at her best, and she must be gaining four or five knots an hour on the chase.
Christy had been through this channel in the Bellevite, and he discovered that the steamer was running near the shoal water.

Presently the captain came on deck, and he appeared to be less nervous than before, perhaps because he had arranged his plan to escape his pursuer.
Within an hour Christy recognized the East Isaac, a rock rising ten or twelve feet above the surface of the water, which he identified by its nearness to one over which the sea was breaking.

The captain was too much occupied in the study of the surroundings to take any notice of him, and he endeavored to keep out of his sight.
The prisoner consulted his watch, and found it was four o'clock.

The tower of the Great Isaac light could just be made out.

The Chateaugay was not more than four miles astern of the Snapper, and in another hour she would certainly come up with her, if Captain Flanger did not put his plan into execution.