There were thirty-nine scientific exhibits entered at the Thirty-third Annual Meeting of the Radiological Society of North America, held in Boston, Nov. 30–Dec. 5, 1947. On the basis of subject matter, there were seven groups: skeletal system, eight exhibits; chest, seven exhibits; gastrointestinal system, four exhibits; genitourinary system, three exhibits; therapy, eight exhibits; radioactive isotopes, three exhibits; miscellaneous, six exhibits. The space available for the exhibits made it impossible to arrange them in groups according to the above classifications. The following awards were given: First Award: Stanley A. Wilson, M.D., Salem Hospital, Salem, Mass., for his exhibit on “Granulomatosis of Lung, Probably Due to Beryllium.” Second Award: John F. Holt, M.D., and Edwin M. Wright, M.D., University Hospital, Ann Arbor, Mich., for their exhibit on “Osseous Manifestations of Neurofibromatosis.” Third Award: John D. Camp, M.D., Mayo Clinic, Rochester, Minn., for his exhibit on a “Grid Front Cassette—A Practical Application of the Stationary Grid.” Honorable Mention went to K. E. Corrigan, Ph.D., H. S. Hayden, Ph.D., E. F. Lang, M.D., and L. Reynolds, M.D., Harper Hospital, Detroit, Mich., for their exhibition “Diagnostic Tracer Studies with Radioactive Iodine.” Exhibits Pertaining to the Skeletal System Hampar Kelikian, M.D., and E. K. Lewis, M.D. (Chicago, Ill.): Arthrograms. Lipiodol-outlined arthrograms and pneumoarthrograms of the knee, ankle, elbow, and acromioclavicular joints were exhibited. The normal anatomy, capacity, contour, content, and communications of these joints as outlined by air injection were shown. Isadore Meschan, M.D. (University of Arkansas, Little Rock, Ark.): An Atlas of Pneumoarthrography of the Knee. This exhibit utilized diagrams and tracings of radiographs together with tables summarizing statistical data on pneumoarthrography of the knee. E. S. Gurdjian, M.D., J. E. Webster, M.D., and H. R. Lissner, M.S. (Wayne University College of Medicine and Grace Hospital, Detroit, Mich.): Mechanism of Production of Linear Skull Fracture— Studies with the Stresscoat. The material presented included experimental work on dogs and monkeys and human studies on cadaver and dry skulls with the stresscoat technic. This involves the application of a strain-sensitive lacquer on the external and internal surfaces of the skull. Deformation of the skull from blows causes cracks in the lacquer, showing the pattern and direction of the strains. John F. Holt, M.D., and Edwin M. Wright, M.D. (University Hospital, Ann Arbor, Mich.): Osseous Manifestations of Neurofibromatosis. This exhibit showed many skeletal abnormalities associated with neurofibromatosis (von Recklinghausen), including disorders of bone growth, bowing and pseudoarthrosis of the lower leg, intra- and extra-osseous erosive defects, periosteal thickening and profound congenital anomalies.