As soon as possible, the wounded President was removed to the Exposition Hospital, and surgeons were quickly in attendance. The medical director of the Exposition, Dr. Roswell Park, President of the American Society of Surgeons, chanced to be absent, at Niagara Falls, where he was performing an operation at the time. The necessary operation upon the President was performed by Dr. Matthew D. Mann, assisted by Dr. Herman Mynter, Dr. Eugene Wasdin, of the Marine Hospital service, and others. The one fatal bullet of the two that were fired was found to have passed through both walls of the stomach, and its further progress was not traced. Dr. Park arrived on the scene before the operation was finished and took part in the subsequent consultations. From the hospital Mr. McKinley was removed to Mr. Milburn’s house, where Mrs. McKinley, being an invalid, had remained that day. There he received all possible care during the eight days in which the nation hoped against hope that he might be saved. Dr. Charles McBurney was called from New York to join the attending physicians and surgeons, and approved all that had been done. For a week there seemed good ground for believing that the sound constitution of the President would defeat the assassin’s attempt; but on Friday the 13th the signs underwent a rapid change, and at fifteen minutes past two o’clock of the morning of Saturday he breathed his last. Vice-President Theodore Roosevelt, who was then at a camp in the Adirondacks, was summoned at once, and arrived in the city that afternoon. At the house of Mr. Ansley Wilcox (whose guest he became), in the presence of the members of the late President’s cabinet and of a few friends and newspaper correspondents, he took the oath of office as President, administered by Judge Hazel, of the United States District Court. Before taking the oath he said: "I wish to say that it shall be my aim to continue, absolutely unbroken, the policies of President McKinley for the peace, the prosperity, and the honor of our beloved country."