Letter from Carrie Flood, Secretary to Professor Gold to Dr A Somogyi, Secretary, Organizing Committee, 11th International Conference on Cosmic Rays, Hungarian Academy of Sciences, Budapest, Hungary Encloses a copy of the lecture given by Professor Thomas Gold at the 11th International Conference on Cosmic Rays in Budapest for publication in the Proceedings of the Conference. The paper is entitled "Pulsars and the Origin of High Energy Particles". 16 September 1969