"You are engaged," said I; "perhaps I interrupt you."

      "Not at all. I am glad to have a friend with whom I can discuss my results. The matter is a perfectly trivial one" -- he jerked his thumb in the direction of the old hat -- "but there are points in connection with it which are not entirely devoid of interest and even of instruction."

      I seated myself in his armchair and warmed my hands before his crackling fire, for a sharp frost had set in, and the windows were thick with the ice crystals. "I suppose," I remarked, "that, homely as it looks, this thing has some deadly story linked on to it -- that it is the clue which will guide you in the solution of some mystery and the punishment of some crime."

      "No, no. No crime," said Sherlock Holmes, laughing. "Only one of those whimsical little incidents which will happen when you have four million human beings all jostling each other within the space of a few square miles. Amid the action and reaction of so dense a swarm of humanity, every possible combination of events may be expected to take place, and many a little problem will be presented which may be striking and bizarre without being criminal. We have already had experience of such."

      "So much so," I remarked, "that of the last six cases which I have added to my notes, three have been entirely free of any legal crime."

      "Precisely. You allude to my attempt to recover the Irene Adler papers, to the singular case of Miss Mary Sutherland, and to the adventure of the man with the twisted lip. Well, I have no doubt that this small matter will fall into the same innocent category. You know Peterson, the commissionaire?"

      "Yes."

      "It is to him that this trophy belongs."

      "It is his hat."

      "No, no, he found it. Its owner is unknown. I beg that you will look upon it not as a battered billycock but as an intellectual problem. And, first, as to how it came here. It arrived upon Christmas morning, in company with a good fat goose, which is, I have no doubt, roasting at this moment in front of Peterson's fire. The facts are these: about four o'clock on Christmas morning, Peterson, who, as you know, is a very honest fellow, was returning from some small jollification and was making his way homeward down Tottenham Court Road. In front of him he saw, in the gaslight, a tallish man, walking with a slight stagger, and carrying a white goose slung over his shoulder. As he reached the corner of Goodge Street, a row broke out between this stranger and a little knot of roughs. One of the latter knocked off the man's hat, on which he raised his stick to defend himself and, swinging it over his head, smashed the shop window behind him. Peterson had rushed forward to protect the stranger from his assailants; but the man, shocked at having broken the window, and seeing an official-looking person in uniform rushing towards him, dropped his goose, took to his heels, and vanished amid the labyrinth of small streets which lie at the back of Tottenham Court Road. The roughs had also fled at the appearance of Peterson, so that he was left in possession of the field of battle, and also of the spoils of victory in the shape of this battered hat and a most unimpeachable Christmas goose."