to spring upon and tear a stuffed figure I would bring into the basement. I noticed he always sprang at the throat. ‘Hard lines.’ thought I, ‘for the burglar who may venture here!’

“It was a little later than this nonsense with the dog, which was a piece of boyishness, a degree of relaxation to the strain of my fight with down-town conditions, that there came in what makes a man think the affairs of this world are not adjusted rightly, and makes recurrent the impulse which was first unfortunate for Abel—no doubt worse for Cain. There is no need for going into details of the story, how I learned, or when. My knowledge was all-sufficient and absolute. My wife and my friend were sinning, riotously and fully, but discreetly—sinning against all laws of right and honour, and against me. The mechanism of it was simple. The grounds back of my house, you know, were large, and you may not have forgotten the lane of tall, clipped shrubbery that led up from the rear to a summer-house. His calls in the evening were made early and ended early. The pinkness of all propriety was about them. The servants suspected nothing. But, his call ended, the graceful gentleman, friend of mine and lover of my wife, would walk but a few hundred paces, then turn and enter my grounds at the rear gate I have mentioned, and pass up the arbour to the pretty summer-house. He would find time for pleasant anticipation there as he lolled upon one of the soft divans with which I had furnished the charming place; but his waiting would not be long; she would soon come to him.

When I learned what I have told—after the first awful five minutes—I don’t like to think of them, even now—I became the most deliberate man on the face of this earth peopled with sinners. Sometimes, they say, the whole substance of a man’s blood may be changed in a second by chemical action. My blood was changed, I think. The poison had transmuted it. There was a leaden sluggishness, but my head was clear.

“I had odd fancies. I remember I thought of a nobleman who had another torn slowly apart by horses for proving false to him at the siege of Calais. His cruelty had been a youthful horror to me. Now I had a tremendous appreciation of the man. ‘Good fellow, good fellow!’ I went about muttering to myself in a foolish, involuntary way. I wondered how my wife’s lover could endure the strain of four strong Clydesdales, each started at the same moment, one north, one south, one east, one west. His charming personal appearance recurred to me, and I thought of his fine neck. Women like a fine-throated man, and he was one. I wondered if my wife’s fancy tended the same way. It was well this idea came to me, for it gave me an inspiration. I thought of the dog.

“There is no harm, is there, in training a dog to pull down a stuffed figure? There is no harm, either, if the stuffed figure be given the simulated habiliments of some friend of yours. And what harm can there be in training the dog in a garden-arbour instead of in a basement? I dropped into the way of being at home a little more. I told my wife she should have alternate nights at least, and she was grateful and delighted. And on the nights when I was at home I would spend half an hour in the grounds with the dog, saying I was training him in new things, and no one paid attention. I taught him to crouch in the little lane close to the summer-house, and to rush down and leap upon the manikin when I displayed it at the other end. Ye gods! how he learned to tear it down and tear its imitation throat! The training over, I would lock him in the basement as usual. But one night I had a dispatch come to me summoning me to another city. The other man was to call that evening, and he came. I left before nine o’clock, but just before going I released the dog. He darted for the post in the garden, and with gleaming eyes crouched, as he had been accustomed to do, watching the entrance of the arbour.

“I can always sleep well on a train. I suppose the regular sequence of sounds, the rhythmic throb of the motion, has something to do with it. I slept well and awoke refreshed when I reached my destination. I was driven to a hotel; I took a bath; I did what I rarely do, I drank a cocktail before breakfast. I sat down at the table; I gave my order, and then lazily opened the morning paper. One of the dispatches deeply interested me.

“‘Inexplicable Tragedy’ was the headline. By the way, ‘Inexplicable Tragedy’ contains just about the number of letters to fill a line neatly in the style of heading now the fashion. I don’t know about such things, but