"Not professionally," his friend answered, with a smile; "though I have often assisted in running down criminals. I have enough of the hound nature about me, however, that when a scent is given me I delight in following the trail till I run my game to cover, as I hope some day to run this man to cover," he added, with peculiar earnestness. "But how did you ever gain so much knowledge of him? To every one else he seems an utter mystery." "Partly, as I said, through a study of him and his methods, and partly from facts which I learned from one of the band who was fatally shot a few years ago in a skirmish between the brigands and a posse of officials. The man was deserted by his associates and was brought to town and placed in a hospital. I did what I could to make the poor fellow comfortable, with the result that he became quite communicative with me, and, while in no way betraying his confederates, he gave me much interesting information regarding the band and its leader. It is a thoroughly organized body of men, bound together by the most fearful oaths, possessing a perfect system of signals and passwords, and with a retreat in the mountains, known as the 'Pocket,' so inaccessible to any but themselves that no one as yet has been able even to definitely locate it--a sort of basin walled about by perpendicular rocks. The leader is a man of mixed blood, who has travelled in all countries and knows many dark secrets, and whose power lies mainly in the mystery with which he surrounds himself. No one knows who he is, but many of his men believe him to be the very devil personified." "But how can you or any one else hope to run down a man with such powerful followers and with a hiding-place so inaccessible?" Darrell inquired. "From a remark inadvertently dropped, I was led to infer that this man spends comparatively little time with the band. He communicates with them, directs them, and personally conducts any especially bold or difficult venture; but most of the time he is amid far different surroundings, leading an altogether different life." "One of those men with double lives," Darrell commented. Mr. Britton bowed in assent. "But if that were so," Darrell persisted, his interest thoroughly aroused, as much by Mr. Britton's manner as by his words, "in the event, say, of your meeting him, how would you be able to recognize or identify him? Have you any clew to his identity?"