The fact was that Dick, while we were near the Dolphin, was as nearly as possible walking overboard, with the intention of getting on her deck, and would have done so had not Truck hauled him back.  Dick had no notion of which was the stem and which the stern of the vessel, or how the wind acted on the sails; nor could he make out why we tacked; and several times he asked how it was that we did not sail directly towards the point to which we wished to go.