THE Association of Scientific Workers is organizing a public meeting and discussion on—“Defence and the Responsibilities of the Scientist”, to be held in the mathematics lecture theatre, Huxley Building, Royal College of Science, Exhibition Road, South Kensington, on Thursday, November 19, at 8 p.m. The chair will be taken by Prof. J. B. S. Haldane, and the speakers will include Prof. S. Chapman and Air Commodore L. E. O. Charlton. It is the purpose of the meeting to provide a forum for the full discussion of problems arising out of the increasing application of science to war. Measures that might be adopted by scientific workers as an organized body to further the cause of peace will also be considered.