(From our Correspondent.) Buffalo, N. Y., September 12. Within an hour of the infliction of the wounds received by President McKinley, he was operated upon at the Exposition Emergency Hospital. The surgeons present were Drs. Matthew D. Mann, Professor of Obstetrics and Gynecology, University of Buffalo; Dr. Herman Mynter, Professor of Operative Surgery, University of Buffalo; Dr. John Parmenter, Professor of Anatomy and Clinical Surgery, University of Buffalo; Dr. E. Wallace Lee, of St. Louis, Mo., who happened to be on the Exposition grounds; Dr. Eugene Wasdin of the Marine-Hospital Service, and Dr. Presley M. Rixey, physician to the President. The operation was performed by Dr. Mann; first assistant, Dr. Herman Mynter; second assistant, Dr. John Parmenter; third assistant, Dr. Lee. Dr. Eugene Wasdin gave the anesthetic, which was ether. The operation lasted forty-five minutes. Dr. Rixey arrived at the latter part of the operation. There were two wounds, one