Calendar: 1968-1969 Page 413

Annual Report of the Delegacy lxxi Higher Degrees Ph Κ Barrett 'Magnetohydrodynamic boundary layer flows over obstacles Ph Cantoni On the representations of the Bondi-Metzner- Sachs group Ph Crampin 'Pseudo-Riemannian and related structures on manifolds Ph Joseph 'Mechanics and optics in general relativity Ph Μ Keating King's College and Queen Mary College Some topics in the theory of orders Ph Ν Kofinti 'Boundary surfaces in general relativity and the gravitational field in matter Ph Kunzle 'Some relations between the geometry of space-time and physical fields Ph McEvett 'Hermitian forms over algebras Ph Saunders 'Non-isotropic model Universes Sc by examination Mustafa West Wigmore Phil Fletcher Ά survey of unique factorization Departmental Notes Professor Semple visited Salisbury in December as member of the Council of the University College of Rhodesia In November he delivered lecture on 'Clifford parallels' to the Mathematical Society of Queen Mary College He also lectured to the University of London Geometry Seminar on 'Minimum models of linear spaces on quadrics' Professor Bondi gave the Henry Sidgwick Memorial Lecture at Cambridge and the Herbert Memorial Lecture in Coventry He also delivered the following lectures to the Oxford University Astronomical Society the Royal College of Physicians the Mathe- matics Society of the University of Warwick the Sussex Branch of the Mathematical Association the Science Society of the University of Sussex the Astronomical and Physical Societies of the University of Glasgow the Mathematics Society of the University of Southamp- ton the Physical Society of the University of Surrey the Mathematical and Physical Society of University College London Carmel College