confidence of Larsan, had not made the journey from Paris for nothing. Perhaps he had come at that critical moment to watch over this place of confinement. Meditating thus and pursuing the logical tenor of his reasoning, Rouletabille had questioned the landlord of the inn near the Castillon tunnel, who had acknowledged to him that he had been very much puzzled the day before by the passage through the tunnel of a man who perfectly answered the description which had been given by the gunsmith. This man had entered the tavern to drink. His manner and appearance were so strange that the landlord had feared that he might have escaped from the sanitarium. Rouletabille felt that he was on the right track and asked as indifferently as he could, “You have a sanitarium near here then?” “Oh, yes,” replied the landlord; “the Mount Barbonnet sanitarium for mental diseases.” It was at this point that the memory of the two syllables “bonnet” flashed in full significance upon the brain of Rouletabille. Henceforth, he had no longer any doubt that the real Darzac had been immolated by the false one as a madman in the sanitarium of Mount Barbonnet. He was resolved to know everything and to venture everything! He was certain that as a reporter of the Epoch he possessed the means of loosening the tongue of proprietors of sanitariums of the kind which take college professors as patients and ask no questions. He hired a carriage and had himself driven to Sospel, which is at the foot of the mountains. He realized that he was running the chance of encountering Brignolles. But, fortunately, nothing of the kind happened and the young man reached Mount Barbonnet and the sanitarium in safety. His mind was filled now with the thought that he was at last--definitely--to learn what had become of Robert Darzac! For at the moment that the sack had been found without the corpse--from the moment that the tracks of the little carriage descended toward Sospel or elsewhere and lost themselves; from the moment that he had discovered that Larsan had not considered it prudent to relieve himself of Darzac by throwing him in the sack into one of the gulfs of Castillon, Rouletabille had believed that Larsan might have found it to his interest to return the living Darzac to the madhouse at Sospel. And the reasoning powers of Rouletabille showed him that this might well be so. Darzac living might be more useful to Larsan than Darzac dead. What hostage would he have otherwise on the day when Mathilde should discover his imposture?