"They bear about two and a half points on our lee-bow, at this moment, sir," I replied.  "And I think that, if we hold all on as we are going now, we shall weather the leading ship--the one that I take to be a frigate--by about half a mile.  They are rising fast, sir--the heads of the leader's topsails are just beginning to show; and if the breeze continues as fresh as it is now we ought to be abreast of them in about,"--I made a rapid calculation--"an hour and a half from this."