x the early stages, to the Programme Committee for their assistance in formulating the programme and for their continued support throughout, to the session chairmen and scientific secretaries, who ensured the smooth running of the proceedings, and to all the delegates, who, by their full participation and lively discussions have demonstrated the continuing vigour of this field of physics. We also gratefully acknowledge the sponsorship of the Institute of Physics, the British Council and IUPAP, and thank the Royal Society for additional financial support. Our thanks also are due to Chester...