Dr. Mudd voluntarily confessed to Captain Dutton, who had charge of the convicts who were sent to the Dry Tortugas, whilst on their voyage thither, that he knew Booth when he came to his house on the morning of the 15th of April; and said that he denied it because he was afraid of endangering his own life, and the lives of his family. He also admitted that he went to Washington by appointment to introduce Booth to Surratt, and that Wiechmann's testimony on this point was true. Why, if innocent, should he have been afraid to let it be known that Booth and Herold called at his house on that morning, and what he had done for them? This fear could only have come from a consciousness of guilt, and shows that he not only knew what they had done, but, also, that he was implicated in their guilt by his previous knowledge of what they were going to do. John H. Surratt, after he had been set at liberty, delivered a lecture at Rockville, Maryland, in which he denied that he ever knew of the plot to assassinate, but admitted that he was a member of a conspiracy to capture President Lincoln and carry him a prisoner to Richmond. He asserts that this was Booth's purpose whilst he was co-operating with him, and that they had spent a great deal of money ($10,000) in preparations to effect their object. He claims that neither the Richmond government, nor its agents in Canada, knew anything about their scheme, and that they alone were responsible for it. Where then did they get their $10,000 to spend on it? They were both without means of their own, and without employment. The Rockville lecture is simply a plausible tissue of falsehoods, well put together, but altogether inconsistent with the whole tenure of the evidence in the case. It is contradicted at almost every point by the testimony we have had under review. Yet its admissions are important, as they establish the theory of the conspiracy which we have maintained. He admits that he was engaged in the secret service of the Confederate government almost constantly from the time he left college in the summer of 1861, and that he enjoyed that service greatly, and was very active in it. He claims that he was entrusted with dispatches for the agents of that government in Canada, and that he passed from the one place to the other frequently. He admits that he reached Montreal on the 6th of April with dispatches from Davis and Benjamin to Thompson. Of course he does not say that he also carried Bills of Exchange on Liverpool at the same time for $70,000, or that he carried funds at any time; but we have had the proof of this fact. He admits that he went from Montreal on the 12th of April, to Elmira, New York, and claims that he remained there until after the assassination.