"That's a puzzle to me," answered Jack.  "I believe that I had jumped up on the taffrail when the vessel gave a kick, and over I went.  I must have sunk, I think, before I knew where I was; and when I came to the surface I instinctively struck out towards the Lively, for I could not see the schooner, as my eyes happened to be turned away from her.  I should have been alongside you in a few minutes, had not that dreadful cramp come on.  Beyond that I really don't know much more."