"Ah, Mr Fortescue," he exclaimed, "you will doubtless be able to do what I want.  Just slip down into my cabin; you will find my glass hanging above the head of my bunk.  Throw the strap of it over your shoulder, and shin up alongside that fellow in the cross-trees; take a good look at the stranger; and report to me any peculiarities that you may detect in her, will ye."