CHAPTER XIV.SICK IN RICHMOND—CONCEALED BY A COLORED BOY AND UNABLE TO MOVE—AN ORIGINAL CIPHER LETTER SENT THROUGH THE BLOCKADE TO WASHINGTON THAT TELLS THE WHOLE STORY IN A FEW WORDS—MEETING WITH MARYLAND REFUGEES—THE BOY SPY SERENADED—"MARYLAND, MY MARYLAND"—JEFF DAVIS' OFFICE AND HOME—A VISIT TO UNION PRISONERS AT LIBBY PRISON, ETC.CHAPTER XV.