One year ago the writer of the letters which follow, visited the Battle Field of Waterloo. In looking over many relics of the combat preserved in the Museum there, he was particularly interested in the files of journals contemporary with the action. These contained the Duke of Wellington's first despatch announcing the victory, the reports of the subordinate commanders, and the current gossip as to the episodes and hazards of the day. The time will come when remarkable incidents of these our times will be a staple of as great curiosity as the issue of Waterloo. It is an incident without a precedent on this side of the globe, and never to be repeated. Assassination has made its last effort to become indigenous here. The public sentiment of Loyalist and Rebel has denounced it: the world has remarked it with uplifted hands and words of execration. Therefore, as long as history shall hold good, the murder of the President will be a theme for poesy, romance and tragedy. We who live in this consecrated time keep the sacred souvenirs of Mr. Lincoln's death in our possession; and the best of these are the news letters descriptive of his apotheosis, and the fate of the conspirators who slew him. I represented the World newspaper at Washington during the whole of those exciting weeks, and wrote their occurrences fresh from the mouths of the actors. Entered according to Act of Congress, in the year 1865