Mr. Lincoln turned to Mr. Usher and said: “Usher, this boy is a monomaniac on the subject of my safety. I can hear him or hear of his being around at all times in the night, to prevent somebody from murdering me. He thinks I shall be killed, and we think he is going crazy. What does any one want to assassinate me for? If any one wants to do so, he can do it any day or night if he is ready to give his life for mine. It is nonsense.” Mr. Usher said to Mr. Lincoln that it was well to heed Lamon’s warning, as he was thrown among people from whom he had better opportunities to know about such matters than almost any one. “Well,” said Mr. Lincoln to Lamon, “I promise to do the best I can toward it.” HOW LINCOLN WAS MURDERED. The assassination of President Lincoln was most carefully planned, even to the smallest detail. The box set apart for the President’s party was a double one in the second tier at the left of the stage. The box had two doors with spring locks, but Booth had loosened the screws with which they were fastened so that it was impossible to secure them from the inside. In one door he had bored a hole with a gimlet, so that he could see what was going on inside the box. An employee of the theatre by the name of Spangler, who was an accomplice of the assassin, had even arranged the seats in the box to suit the purposes of Booth. On the fateful night the theatre was packed. The Presidential party arrived a few minutes after nine o’clock, and consisted of the President and Mrs. Lincoln, Miss Harris and Major Rathbone, daughter and stepson of Senator Harris of New York. The immense audience rose to its feet and cheered the President as he passed to his box. Booth came into the theatre about ten o’clock. He had not only, planned to kill the President, but he had also planned to escape into Maryland, and a swift horse, saddled and ready for the journey, was tied in the rear of the theatre. For a few minutes he pretended to be interested in the performance, and then gradually made his way back to the door of the President’s box. Before reaching there, however, he was confronted by one of the President’s messengers, who had been stationed at the end of the passage leading to the boxes to prevent any one from intruding. To this man Booth handed a card saying that the President had sent for him, and was permitted to enter. Once inside the hallway leading to the boxes, he closed the hall door and fastened it by a bar prepared for the occasion, so that it was impossible to open it from without. Then he quickly entered the box through the right-hand door. The President was sitting in an easy armchair in the left-hand corner of the box nearest the audience. He was leaning on one hand and with the other had hold of a portion of the drapery. There was a smile on his face. The other members of the party were intently watching the performance on the stage.