By Dr. Allan Marble
On Nov. 8, 1895, Prof. Wilhelm Roentgen at the University of Wiirzburg, Germany, demonstrated the existence of X-rays, showing that if they were caused to pass though a human hand, the bones in the hand would be rendered visible on a photographic plate. The news of this discovery's potential to aid in medical diagnosis quickly spread throughout the world. As early as February 1896, Prof. John Cox was using X-rays in clinical diagnosis at McGill University.