Miscellaneous departmental correspondence, including correspondence with F. Ward of the United States Air Force, Cambridge Research Laboratories, Bedford, Massachusetts; J.A. Ratcliffe of the Radio and Space Research Station, Slough; F. Heard of the David Dunlap Observatory, Ontario, Canada; Father F. Bertian of the Specola Vaticana, Castel Gandolfo, Vatican City; A.D. Thackeray of the Radcliffe Observatory, Pretoria; B.G. Pressey of the Science Research Council; Pierre Langue of the Observatory, Besançon; J.D. McGee of Imperial College, London; U.R. Madwar of Cairo; T.L.L. Richards of the University of Aston, including a paper by Richards titled 'A Terrestrial Shear Pattern?'; and R.V. Willstrop of The Observatories, Cambridge.