"Certainly," I said.  "You, of course, will take command of the brig, and Keene must take command here, with just enough men to enable him to handle the ship, which, by the by, has a full cargo of slaves aboard, I perceive."  There could be no possible doubt as to this last, for there was a thin, bluish-white vapour of steam curling up through the gratings which closed the hatchways, the effluvium emanating from which was almost unendurable.