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 unobtrusive fashion, why did he blazon himself all over with all the stars of the sky, and profess to give public lectures on all the subjects of the world? Every wise and well-conducted student of murder stories is acquainted with the notion of a policeman in plain clothes. But nobody could possibly say that this gentleman was in plain clothes. Why not wear his uniform, if he was resolved to show every stranger in the street his badge? Perhaps after all he had no uniform; for these lands were but recently a wild frontier rudely ruled by vigilance committees. Some Americans suggested to me that he was the Sheriff; the regular hard-riding, free-shooting Sheriff of Bret Harte and my boyhood's dreams. Others suggested that he was an agent of the Ku-Klux Klan, that great nameless revolution of the revival of which there were rumours at the time; and that the symbol he exhibited was theirs. But whether he was a sheriff acting for the law, or a conspirator against the law, or a lunatic entirely outside the law, I agree with the former conjectures upon one point. I am perfectly certain he had something else in his pocket besides a badge. And I am perfectly certain that under certain circumstances he would have handled it instantly, and shot me dead between the gay bookstall and the crowded trams. And that is the last touch to the complexity; for though in that country it often seems that the law is made by a lunatic, you never know when the lunatic may not shoot you for keeping it. Only in the presence of that citizen of Oklahoma I feel I am confronted with the fullness and depth of the mystery of America. Because I understand nothing, I recognise the thing that we call a nation; and I salute the flag.