later; he therefore instructed the helmsman to make a very wide and gradual sweep to the eastward, hauling up almost imperceptibly at the rate of a point every quarter of an hour, and thus rendering it absolutely impossible for an observer to guess whether the _Thetis_ was going out through the Florida Strait or down the Nicholas and Old Bahama channels. Also, for the first hour he allowed her to travel at the sober pace of fourteen knots; after which he spoke down the voice tube to Macintyre in the engine-room, and the next instant the little craft was shearing through the long, foam-flecked surges like a chasing dolphin, as the Scotchman gave her all the steam that her engines could take. It was about seven bells in the afternoon watch when, the yacht running in toward the land on a south-easterly course, the head of the mast from which the light on Hicacal Cay is shown appeared dead ahead, and Milsom at once gave orders for the engines to be slowed down to fourteen knots. Then, turning to Jack, he said: "Now, young man, I shall want your assistance, for I am going to personally undertake the job of piloting the little hooker into her hiding-place. The chart still lies spread out on the chart-house table, where we left it last night, and with that before you you ought to be able to con the ship into the Boca without the slightest difficulty. Once she is there, I will take charge again, and give you my directions from the fore-masthead, whither I am about to go; and I shall want you to stand by the engine-room telegraph and transmit my orders to the engine-room smartly. You had better keep that mast yonder fair and square over the bowsprit end until the Boca opens out clearly; then you can ease your helm over to port and head her straight in. Now, I'm off."