Soon after daybreak we were on deck in our shirts, intending to jump overboard and take a swim.  Jack and Oliver made their appearance at the same moment on board the Dolphin, and shouting to us, overboard they went, and came swimming up.  I, pulling my shirt over my head, followed their example.  Dick, forgetting to pull off his shirt, with wonderful courage--which arose, however, from ignorance--plunged after me, when to our dismay we discovered that he had no notion of swimming.  I was already some distance from the side of the vessel.