THE H. H. Wills Physical Laboratory and the Department of Adult Education of the University of Bristol, in co-operation with the Institute of Physics, will be conducting in Bristol during September 19–24 a summer school in theoretical physics, with particular application to crystal growth and related problems. Lectures will be given by Prof. N. F. Most Dr. F. C. Frank and others. The present course is similar in conception to those of previous years, and is intended mainly for research students at universities and for the members of the staffs of Government and industrial laboratories who wish to familiarize themselves with the theoretical aspects of subjects with which they are, or have been, concerned on the experimental side. In addition to the regular lectures, there will be opportunities for research workers attending this course to discuss their own work and its theoretical implications. The course will refer to the development of ideas brought forward at the Conference of the Faraday Society in April of this year. The fee for the course is six guineas, but a limited number of free places will be available for students. The total number attending the course will be limited to about fifty. Further particulars and forms of application, to be returned before July 10, can be obtained either from the Director of the Department of Adult Education, University, Bristol, 8, or from the Secretary of the Institute of Physics, 47 Belgrave Square, London, S.W.1.