“Very well,” said Thorndyke. “Let me retrace the train of discoveries and inferences in their order. First I learned that an object, supposed to be a barbaric sword of some kind, had disappeared about the time of the murder--if it _was_ a murder. Then we heard from Carston that Sir Gilbert Herrington had appropriated the insignia and ceremonial objects belonging to the King of Bekwè; that some had subsequently been restored, but others had been given to friends as curios. As I listened to that story, the possibility occurred to me that this curio which had disappeared might be one of the missing ceremonial objects. It was not only possible: it was quite probable. For Giles Herrington was a very likely person to have received one of these gifts, and his morose temper made it unlikely that he would restore it. And then, since such an object would be of great value to somebody, and since it was actually stolen property, there would be good reasons why some interested person should take forcible possession of it. This, of course, was mere hypothesis of a rather shadowy kind. But when you produced an object which I at once suspected, and then proved, to be an elephant’s hair, the hypothesis became a reasonable working theory. For, among the ceremonial objects which form what we may call the regalia of a West African king, is the elephant’s tail which is carried before him by a special officer as a symbol of his power and strength. An elephant’s tail had pretty certainly been stolen from the king, and Carston said nothing about its having been restored. “Well, when we went to Herrington’s chambers just now, it was clear to me that the thing which had disappeared was certainly not a sword. The phantom shape on the wall did not show much, but it did show plainly that the object had hung from the nail by a large loop at the end of the handle. But the suspension loop of a sword or dagger is always on the scabbard, never on the hilt. But if the thing was not a sword, what was it? The elephant’s hair that you found on the floor seemed to answer the question. “Now, as we came in, I had noticed on the door-post the West African name, Kwaku Essien. A man whose name is Kwaku is pretty certainly a negro. But if this was an elephant’s tail, its lawful owner was a negro, and that owner wanted to recover it and was morally entitled to take possession of it. Here was another striking agreement. The chambers over Herrington’s were occupied by a negro. Finally, you found among the floor dust a negro’s hair. Then a negro had actually been in this room. But from what we know of Herrington, that negro was not there as an invited visitor. All the probabilities pointed to Mr. Essien. But the probabilities were not enough to act on. Then we had a stroke of sheer luck. We got the chance to explore Essien’s chambers and seek the crucial fact. But here we are at Scotland Yard.”