[Footnote 1: Though properly belonging in Vol. V., with Diseases of the Nervous System, this section has been placed here for convenience.] MYALGIA. By JAMES C. WILSON, A.M., M.D. . . . . . . . . . . . . . 529 PROGRESSIVE MUSCULAR ATROPHY. By JAMES TYSON, A.M., M.D. . . . . . 540 PSEUDO-HYPERTROPHIC PARALYSIS. By MARY PUTNAM JACOBI, M.D. . . . . 557 DISEASES OF THE SKIN. DISEASES OF THE SKIN. By LOUIS A. DUHRING, M.D., and HENRY W. STELWAGON, M.D. . . . . . . . . . . . . . . . . . . . . . . . . 583 MEDICAL OPHTHALMOLOGY. MEDICAL OPHTHALMOLOGY. By WILLIAM F. NORRIS, A.M., M.D. . . . . . 737 MEDICAL OTOLOGY. MEDICAL OTOLOGY. By GEORGE STRAWBRIDGE, M.D. . . . . . . . . . . . 807 INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 843 CONTRIBUTORS TO VOLUME IV. BAER, B. F., M.D., Professor of Obstetrics and Gynæcology in the Philadelphia Polyclinic and College for Graduates in Medicine, and Dean of the Faculty; Obstetrician to Maternity Hospital; President of the Obstetrical Society of Philadelphia, etc. BYFORD, WILLIAM H., M.D., Professor of Gynæcology in the Rush Medical College, Chicago. DELAFIELD, FRANCIS, M.D., Professor of Pathology and Practical Medicine in the College of Physicians and Surgeons, New York. DUDLEY, EDWARD C., A.B., M.D., Professor of Gynæcology in the Chicago Medical College, Chicago. DUHRING, LOUIS A., M.D., Professor of Skin Diseases in the University of Pennsylvania, Philadelphia. EDES, ROBERT T., M.D., Jackson Professor of Clinical Medicine in Harvard University, Boston, Mass. ENGELMANN, GEORGE J., M.D. (Berlin), Professor of Obstetrics and Gynæcology in the St. Louis Polyclinic and Post-Graduate School of Medicine. GOODELL, WILLIAM, M.D., Professor of Clinical Gynæcology in the University of Pennsylvania, Philadelphia. GROSS, SAMUEL W., A.M., M.D., Professor of the Principles of Surgery and of Clinical Surgery in the Jefferson Medical College of Philadelphia. JACOBI, MARY PUTNAM, M.D., Professor of Materia Medica and Therapeutics in the Women's Medical College, New York, and Professor of Diseases of Children at the New York Post-Graduate School. JAGGARD, W. W., A.M., M.D., Professor of Obstetrics in the Chicago Medical College, Medical Department Northwestern University; Obstetrician to Mercy Hospital, Chicago. JENKS, EDWARD W., M.D., LL.D., Detroit, Michigan, Formerly Professor of Medical and Surgical Diseases of Women and Clinical Gynæcology in the Chicago Medical College, and in the Post-Graduate Medical School of New York. KEYES, EDWARD L., A.M., M.D., Professor of Genito-Urinary Surgery and Syphilis in the Bellevue Hospital Medical College, New York; Surgeon to Bellevue Hospital; Consulting Surgeon to the Charity Hospital. NORRIS, WILLIAM F., A.M., M.D., Clinical Professor of Ophthalmology in the University of Pennsylvania, Surgeon to Wills Ophthalmic Hospital, Philadelphia.