"It is sad--very sad," I remarked. "We have just concluded the post-mortem;" and then I introduced the police surgeon to the man whose name was a household word throughout the medical profession. I showed my chief the wound, explained its extraordinary features, and asked his opinion. He removed his coat, turned up his shirt-cuffs, adjusted his big spectacles, and, bending beside the board upon which the body lay, made a long and careful inspection of the injury. "Extraordinary!" he ejaculated. "I've never known of such a wound before. One would almost suspect an explosive bullet, if it were not for the clean incised wound on the exterior. The ribs seem grazed, yet the manner in which such a hurt has been inflicted is utterly unaccountable." "We have been unable to solve the enigma," Dr. Farmer observed. "I was an army surgeon before I entered private practice, but I have never seen a similar case." "Nor have I," responded Sir Bernard. "It is most puzzling." "Do you think that this knife could have been used?" I asked, handing my chief the weapon. He looked at it, raised it in his hand as though to strike, felt its edge, and then shook his head, saying: "No, I think not. The instrument used was only sharp on one edge. This has both edges sharpened." It was a point we had overlooked, but at once we agreed with him, and abandoned our half-formed theory that the Indian dagger had caused the wound. With Sir Bernard we made an examination of the tongue and other organs, in order to ascertain the progress of the disease from which the deceased had been suffering, but a detailed account of our discoveries can have no interest for the lay reader. In a word, our conclusions were that the murdered man could easily have lived another year or more. The disease was not so advanced as we had believed. Sir Bernard had a patient to see in Grosvenor Square; therefore he left at about four o'clock, regretting that he had not time to call round at the neighbour's and express his sympathy with the widow. "Give her all my sympathies, poor young lady," he said to me. "And tell her that I will call upon her to-morrow." Then, after promising to attend the inquest and give evidence regarding the post-mortem, he shook hands with us both and left. At eight o'clock that evening I was back in my own rooms in Harley Place, eating my dinner alone, when Ambler Jevons entered. He was not as cheery as usual. He did not exclaim, as was his habit, "Well, my boy, how goes it? Whom have you killed to-day?" or some such grim pleasantry. On the contrary, he came in with scarcely a word, threw his hat upon a side table, and sank into his usual arm chair with scarcely a word, save the question uttered in almost a growl: "May I smoke?" "Of course," I said, continuing my meal. "Where have you been?" "I left while you were cutting up the body," he said. "I've been about a lot since then, and I'm a bit tired." "You look it. Have a drink?"