“No, Watson, I fear that I could not undertake to recognize your footprint amid all the footprints of the world. If you seriously desire to deceive me you must change your tobacconist; for when I see the stub of a cigarette marked Bradley, Oxford Street, I know that my friend Watson is in the neighbourhood. You will see it there beside the path. You threw it down, no doubt, at that supreme moment when you charged into the empty hut.”
