Let us next see to what extent the head of the rebel Confederacy, Jefferson Davis, is implicated in it by the evidence. We have already seen by his favorable reception of the Alston letter and the endorsement he put upon it, that there was nothing in his mind or moral nature that revolted at its base, cowardly, and dishonorable proposition to "strike at the very heart's blood of some of our country's deadliest foes." On the contrary, he refers it to his Assistant Secretary of War, marked "For attention." Having obtained this index to the state of his mind, we find ourselves prepared to receive the testimony of Dr. J. B. Merritt as to a letter read by Sanders in a meeting of rebels in Montreal, about the middle of February, 1865, at which ten or fifteen persons were present, amongst whom were Sanders, Colonel Steele, Captain Scott, George Young, Byron Hill, Caldwell, Ford, Benedict, Kirk, and Merritt. Sanders said he had received the letter from "the President of our Confederacy" (meaning Jefferson Davis). The substance of this letter was, that if the confederates in Canada and in the States were willing to submit to be governed by such a tyrant as Lincoln he did not wish to recognize them as friends and associates, and he expressed his approbation of any measures they might take to accomplish this object. It is true Dr. Merritt did not see Davis's signature to the letter, and would not have known it had he seen it, but the letter was first read openly by Sanders, and then handed to the others, several of whom read it, and none questioned either its author or authenticity. Colonel Steele, Young, Hill, and Captain Scott read it, and no objection was raised. After reading this letter, Sanders went on to name a number of persons who were ready and willing, as he said, to engage in the undertaking to remove the President, Vice-President, the cabinet, and some of the leading generals, and said there was any amount of money to accomplish the purpose. Amongst the persons whom he said thus stood ready to engage in this work, he named Booth, George Harper, Charles Caldwell, one Randall, and Harrison (by which name Surratt was known), and one or two others, one of whom they called "Plug Tobacco," or "Port Tobacco." I will here remark that Atzerodt was sometimes called by this latter name. Sanders said that Booth was heart and soul in this project of assassination, and felt as much as any person could feel, for the reason that he was a cousin to Beall, who was hung in New York. He said that if they could dispose of Mr. Lincoln it would be an easy matter to dispose of Mr. Johnson; he was such a drunken sot it would be an easy matter to dispose of him in some of his drunken revelries.