LYMAN, HENRY M., A.M., M.D., Professor of Physiology and of Diseases of the Nervous System in Rush Medical College, Chicago; Professor of Theory and Practice of Medicine in the Woman's Hospital Medical College, Chicago; one of the Attending Physicians to the Presbyterian Hospital, Chicago, Ill. MILES, FRANCIS T., M.D., Professor of Physiology and Clinical Professor of Diseases of the Nervous System, University of Maryland, Baltimore. MILLS, CHARLES K., A.M., M.D., Professor of Diseases of the Mind and Nervous System in the Philadelphia Polyclinic and College for Graduates in Medicine; Lecturer on Mental Diseases in the University of Pennsylvania; Neurologist to the Philadelphia Hospital. MINOT, FRANCIS, M.D., Hersey Professor of the Theory and Practice of Physic in Harvard University; Physician to Massachusetts General Hospital. MITCHELL, S. WEIR, M.D., Member of the National Academy of Sciences; President of the College of Physicians of Philadelphia. PUTNAM, JAMES J., A.B. (Harv.), M.D. (Harv.), Physician to Out-patients at the Massachusetts General Hospital; Clinical Instructor at Harvard Medical College. SCHMIDT, H. D., M.D., Pathologist to the Charity Hospital of New Orleans. SEGUIN, EDWARD C., M.D., Clinical Professor of Diseases of the Mind and Nervous System in the College of Physicians and Surgeons, New York City. SINKLER, WHARTON, M.D., Physician to the Philadelphia Orthopædic Hospital, and Infirmary for Nervous Diseases. SPITZKA, E. C., M.D., Consulting Neurologist to the North-eastern Dispensary, and Physician to the Department for Nervous Diseases of the German Poliklinik. STARR, M. ALLEN, M.D., PH.D., Professor of Diseases of the Mind and Nervous System, New York Polyclinic; Attending Physician to Department of Nervous Diseases, Demilt Dispensary. WILSON, JAMES C., A.M., M.D., Physician to the Philadelphia Hospital, and to the Hospital of the Jefferson College; President of the Pathological Society of Philadelphia. WOOD, HORATIO C., M.D., LL.D., Clinical Professor of Diseases of the Nervous System and Professor of Materia Medica and Therapeutics in the University of Pennsylvania; Neurologist to the Philadelphia Hospital; Member of the National Academy of Sciences. ILLUSTRATIONS. FIGURE PAGE 1. DIAGRAM SHOWING THE ARC FOR REFLEX ACTION . . . . . . . . . . 51 2. DIAGRAM AND TABLE SHOWING THE APPROXIMATE RELATION TO THE SPINAL NERVES OF THE VARIOUS SENSORY AND REFLEX FUNCTIONS OF THE SPINAL CORD . . . . . . . . . . . . . . . . . . . . 53 3. CONTRACTION OF NORMAL ABDUCTOR INDICIS WITH STRONG CURRENT (AMIDON) . . . . . . . . . . . . . . . . . . . . . . . . . 67 4. CONTRACTION OF PARALYED MUSCLE ON THIRTY-FIRST DAY OF BELL'S PALSY OF THE FACE (AMIDON) . . . . . . . . . . . . . . . . 67