"I wished Mr. Acton to be present while I demonstrated this small matter to you," said Holmes, "for it is natural that he should take a keen interest in the details. I am afraid, my dear Colonel, that you must regret the hour that you took in such a stormy petrel as I am." "On the contrary," answered the Colonel, warmly, "I consider it the greatest privilege to have been permitted to study your methods of working. I confess that they quite surpass my expectations, and that I am utterly unable to account for your result. I have not yet seen the vestige of a clue." "I am afraid that my explanation may disillusionize you, but it has always been my habit to hide none of my methods, either from my friend Watson or from anyone who might take an intelligent interest in them. But first, as I am rather shaken by the knocking about which I had in the dressing-room, I think that I shall help myself to a dash of your brandy, Colonel. My strength has been rather tried of late." "I trust you had no more of those nervous attacks." Sherlock Holmes laughed heartily. "We will come to that in its turn," said he. "I will lay an account of the case before you in its due order, showing you the various points which guided me in my decision. Pray interrupt me if there is any inference which is not perfectly clear to you. "It is of the highest importance in the art of detection to be able to recognise out of a number of facts which are incidental and which vital. Otherwise your energy and attention must be dissipated instead of being concentrated. Now, in this case there was not the slightest doubt in my mind from the first that the key of the whole matter must be looked for in the scrap of paper in the dead man's hand. "Before going into this I would draw your attention to the fact that if Alec Cunningham's narrative was correct, and if the assailant after shooting William Kirwan had _instantly_ fled, then it obviously could not be he who tore the paper from the dead man's hand. But if it was not he, it must have been Alec Cunningham himself, for by the time that the old man had descended several servants were upon the scene. The point is a simple one, but the Inspector had overlooked it because he had started with the supposition that these county magnates had had nothing to do with the matter. Now, I make a point of never having any prejudices and of following docilely wherever fact may lead me, and so in the very first stage of the investigation I found myself looking a little askance at the part which had been played by Mr. Alec Cunningham. [Illustration: "THE POINT IS A SIMPLE ONE."] "And now I made a very careful examination of the corner of paper which the Inspector had submitted to us. It was at once clear to me that it formed part of a very remarkable document. Here it is. Do you not now observe something very suggestive about it?" "It has a very irregular look," said the Colonel.