"Thank you, sir.  It was an interesting assignment." The old gentleman took off the cloak that set him apart from ordinary mortals, folded it carefully and laid it on the seat.  He sighed, relaxed, and his features lost professional detachment, warmed and mellowed.  He took out cigars, offered them to the others; Frisby took one and they shared a light. "I do not smoke," Cavendish remarked through a thick cloud, "while on duty.  It interferes with optimum functioning of the senses."