This is a text on superconductivity, an area of intense research activity worldwide. The book is in three parts. The first covers the London, Pippard and GinzburgSHLandau theories, which are used to discuss a wide range of phenomena involving surface energies, vorticity, the intermediate and mixed states, boundaries and boundary conditions, the upper critical field in bulk, thin film and anisotropic superconductors, and surface superconductivity. The second part discusses the microscopic theory of Bardeen, Cooper and Schrieffer. The theory is used to discuss quasi particle tunneling and the...