sity of London, on Xov. 10 and 11, 1953. As with previoue conferences of the British group, papers were read concerning the electron microscope and a wide range of its applications. Twenty-three papers were given reporting on electron optics, chemical applications, reflection microscopy, carbon, silica, and plastic replica techniques, thin sectioning, and particulate structures in biological materials. The proceedings were summarized by Challice (38). This same group held its 1955 conference on July 5 to 7 at the University of Glasgow. Forty-one papers were read: 16 on instrumentation and general techniques, four on crystals, plastics, and air pollution studies, and six on metallurgical applications.