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OXFORD INTERNATIONAL CONFERENCE ON ELEMENTARY PARTICLES An international conference on elementary particles will be held in Oxford, England from the 19th-25th September, 1965. The Conference is being organized by the Rutherford High Energy Laboratory and will be similar to the meetings at Aix-en-Provence (1961) and Sienna (1963). The programme is designed primarily for young physicists actively working in the field of elementary particles. Attendance will be by invitation only. All communications concerning the conference should be addressed to Mr. R. C. Pepperell, Scientific Conference Secretariat, Rutherford High Energy Laboratory, Chilton, Dideot, Berks, England.
T O AMERICAN CONTRIBUTORS The Editor regrets to inform American contributors that owing to pressure of other work Pro= fessor G. C. Wick has withdrawn for the time being from the Board of Editors. Manuscripts should therefore no longer be sent to him, but to another of the American members of the editorial board.