John Cadwalader, R. Simpson, John Swift, Thomas McGrath, S. R. Carnahan, Samuel Hays, Geo. H. Martin, A. L. Roumfort, W. Deal, John W. Forney, Isaac Leech, Jr., C. Ingersoll, James Page, Harry Connelly, Frederick McAdams. The Governor, who, as far as was in his power, had apprized himself of the facts of the case, and had taken the measures which devolved upon him by reason of his office, replied immediately. He knew the danger of inflaming the public mind upon a subject which was then exciting the whole Union. The law had prescribed the proper officers to act in every emergency, and he knew they were upon the alert, with their police force strengthened for the occasion. Whatever might have been the motive for addressing the Governor, the following letter was a full and sufficient answer. PHILADELPHIA, Sept. 14, 1851. To Messrs. John Cadwalader, A. L. Roumfort, Jas. Page, C. Ingersoll, Isaac Leech, Jr., R. Simpson, W. Deal, George H. Martin, Samuel Hays, S. R. Carnahan, Thos. McGrath, John Swift, Frederick McAdams: _Gentlemen_--Your letter, without date, was this afternoon put into my hands by one of the servants of the hotel. The anxiety which you manifested to maintain the laws of the land and the public peace, is fully appreciated, and I have great pleasure in informing you that, more than twenty-four hours before the receipt of your letter, the parties implicated had been, through the vigilance and decision of the local authorities, arrested, and are now in prison, awaiting an inquiry into their imputed guilt. The District Attorney and Sheriff of Lancaster county, acting in concert with the Attorney-General of the State, deserve especial thanks for their prompt and energetic conduct. This was all done early on Saturday morning, and duly reported to me by the local officers. The testimony taken by the U. S. Commissioner, who arrived at a later period on the ground, a printed copy of which has accidentally reached me this afternoon, confirms me in the belief that the State authorities had vindicated the law, and, to a large extent, arrested the perpetrators of the crimes. The cruel murder of a citizen of a neighboring State, accompanied by a gross outrage on the laws of the United States, in the resistance of its processes, has been committed; and you may be assured that so soon as the guilty agents are ascertained, they will be punished to its severest penalty by the law of Pennsylvania. I am very proud that the first steps to detect and arrest these offenders have been taken by Pennsylvania officers.