A meeting of the Radiofrequency Spectroscopy Group was held in Newcastle on September 22nd and 23rd to discuss recent work on “Magnetic Resonance of the Solid State”. The number attending this meeting and the keen interest in the work reported were striking evidence of the increasing power of these new techniques as a probe into the details of solid‐state structure and interactions. The general theme of the discussion was the study of impurities and defects in ionic crystals, which appropriately linked with the research being carried out by Dr. Schneider's group at Newcastle itself. The study of impurity and defect centers is a subject in which magnetic resonance is making very considerable contributions at the moment, in a somewhat similar way to its applications in detailed organic analysis and the investigation of free‐radical systems on the more chemical side.