The most casual observer of medical progress in the United States must have noticed from the report of the proceedings annually made in the medical journals that the Medical Society of the State of Pennsylvania is accomplishing a great deal of valuable scientific work. For several years the annual volume of transactions has been found teeming with records of experimental and clinical investigation, giving the results of the labors of the most eminent and accomplished physicians of Philadelphia and the entire State of Pennsylvania. Such original observers and indefatigable workers as Oscar H. Allis, R. J. Levis, William Goodell, Trail Green, R. S. Sutton, Wm. Pepper and James C. Wilson have chosen the annual meeting of the State Society as the occasion for presenting to the profession the result of their work. The volume before us embodies the proceedings of the thirty-fourth annual session, held at Norristown in May, 1883.