Then I explained to my naval friend my own experience. "He tried," I said, "to play the disguise game on me, and clean bowled me the first time. While he was laughing over my discomfiture I studied his face more closely than a lover does that of his mistress. I tried to penetrate his methods. He never wears a wig or false hair; he is too wise for that folly. Yet he seems able to change his hair from light to dark, to make it lank or curly, short or long. He does it; how I don't know. He alters the shape of his nose, his cheeks, and his chin. I suppose that he pads them out with little rubber insets. He alters his voice, and his figure, and even his height. He can be stiff and upright like a drilled soldier, or loose-jointed and shambling like a tramp. He is a finished artist, and employs the very simplest means. He could, I truly believe, deceive his wife or his mother, but he will never again deceive me. I am not a specially observant man; still one can make a shot at most things when driven to it, and I object to being the subject of Dawson's ribaldry. If you will take my tip, you will be able to spot him as readily as I do now." "Good. I should love to score off Dawson. He is an aggravating beast." "Study his ears," said I. "He cannot alter their chief characters. The lobes of his ears are not loose, like yours or mine or those of most men and women; his are attached to the back of his cheekbones. My mother had lobes like those, so had the real Roger Tichborne; I noticed Dawson's at once. Also at the top fold of his ears he has rather a pronounced blob of flesh. This blob, more prominent in some men than in others, is, I believe, a surviving relic of the sharp point which adorned the ears of our animal ancestors. Dawson's ancestor must have been a wolf or a bloodhound. Whenever now I have a strange caller who is not far too tall or far too short to be Dawson, if a stranger stops me in the street to ask for a direction, if a porter at a station dashes up to help me with my bag, I go for his ears. If the lobes are attached to the cheekbones and there is a pronounced blob in the fold at the top, I address the man instantly as Dawson, however impossibly unlike Dawson he may be. I have spotted him twice now since he bowled me out, and he is frightfully savage--especially as I won't tell him how the trick is done. He says that it is my duty to tell him, and that he will compel me under some of his beloved Defence of the Realm Regulations. But the rack could not force me to give away my precious secret. Cherish it and use it. You will not tell, for you love to mystify the ruffian as much as I do." "I will watch for his ears when he next calls, which, I expect, will be to-morrow. Thank you very much. I won't sneak."