"Gentlemen," he went on, "hitherto the police have remained impotent, and justice has been disarmed, in presence of a number of serious cases of crime, committed recently and still unsolved. Let me recall these cases to your memory: they were the murder of the Marquise de Langrune at her château of Beaulieu; the robberies from Mme. Van den Rosen and the Princess Sonia Danidoff; the murder of Dollon, the former steward of the Marquise de Langrune, when on his way from the neighbourhood of Saint-Jaury to Paris in obedience to a summons sent him by M. Germain Fuselier; and, lastly, the murder of Lord Beltham, prior to the cases just enumerated, for which the prisoner in the dock is at this moment standing his trial. Gentlemen, I have to say that all these cases, the Beltham, Langrune and Dollon murders, and the Rosen-Danidoff burglaries, are absolutely and indisputably to be attributed to one and the same individual, to that man standing there--Gurn!" Having made this extraordinary assertion, Juve again turned round towards the prisoner. That mysterious person appeared to be keenly interested in what the detective said, but it would have been difficult to say whether he was merely surprised, or not rather perturbed and excited as well. Juve hushed, with a wave of his hand, the murmur that ran round the court, and resumed his address. "My assertion that Gurn is the sole person responsible for all these crimes has surprised you, gentlemen, but I have proofs which must, I think, convince you. I will not go into the details of each of those cases, for the newspapers have made you quite familiar with them, but I will be as brief and as lucid as I can. "My first point, gentlemen, is this: the murderer of the Marquise de Langrune and the man who robbed Mme. Van den Rosen and Princess Sonia Danidoff are one and the same person. "That is shown beyond dispute by tests made in the two cases with a Bertillon dynamometer, an instrument of the nicest exactitude, which proved that the same individual operated in both cases; that is one point made good. And next, the man who robbed Mme. Van den Rosen and Princess Sonia is Gurn. That is proved to equal demonstration by the fact that the burglar burned his hand while engaged upon his crime, and that Gurn has a scar on his hand which betrays him as the criminal; the scar is faint now perhaps, but I can testify that it was very obvious at the time of a disturbance which occurred at a low café named the Saint-Anthony's Pig, where, accompanied by detective Lemaroy, who is still in hospital for treatment for injuries received on that occasion, I attempted, and failed, to arrest this man Gurn. "Thus, gentlemen, I prove that the Langrune and Danidoff cases are the work of but one man, and that man, Gurn.