News and Comment: ANNOUNCEMENTS

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Second International Congress of Neurological Surgery.—  The Scientific Program of the Second International Congress of Neurological Surgery Meeting at the Statler Hilton, Washington, D.C., is as follows:

Monday, Oct. 16, 1961 9 A.M.-12 NOON  SYMPOSIUM I. RADIOACTIVITY AND HEAVY RADIATION PARTICLESWilliam H. Sweet, U.S.A., Moderator Biological Effects of Heavy Radiation ParticlesCornelius A. Tobias, U.S.A., essayist Lee E. Farr, U.S.A., discusserDisruption of Nervous Tissue by Radiation Webb Haymaker, U.S.A., essayist Samuel P. Hicks, U.S.A., discusserDiagnostic Uses of Radioisotopes Thérése Planiol, France, essayist Bertram Selverstone, U.S.A., discusser Lyle A. French, U.S.A., discusserTherapeutic Uses of Radioisotopes Jean Talairach, France, essayist John Hankinson, England, discusserCerebral Radiosurgery Lars Leksell, Sweden, essayist John H. Lawrence, U.S.A., discusser

2 P.M.-5 P.M.  GENERAL SESSION (Voluntary Papers)Radioactive Bismuth (Bi²⁰⁶), Its Biological Basis and Results of Localizations and Possible Specific Diagnosis of Intracranial Expansive Lesions F. Mundinger, GermanyHistological and Dosimetric Correlations