Meanwhile, as previously arranged, Captain Harrison was aroused, and informed of the fact that the decoy schooner, or what was assumed to be such, had made her appearance and was now fairly at sea, steering a little to the northward of west under a heavy press of sail; and close upon the heels of the returning messenger the worthy skipper himself appeared.  He sprang upon a gun-carriage and peered intently shoreward under the shade of his hand; but only the upper canvas of the stranger was visible from our deck; and he impatiently hailed the look-out aloft to give him a detailed description of the vessel.  The fellow in the cross-trees happened, however, to be a poor sort of unintelligent fellow, and could say very little about the craft beyond stating the fact that she was a schooner, painted black; that she sat deep in the water, showed an immense spread of canvas, and appeared to be very fast.