' ... this is an admirable book. Indeed, it scarcely needs my commendation: it is already being widely used as a graduate text on both sides of the Atlantic.' Nature ' ... this book is admirably suited to anyone wishing to learn about the mathematical methods used in the physics of the solid state, who has adequate preparation ... and the book should serve well as a text for a graduate course.' American Journal of Physics 'An outstanding account of the theoretical principles of the physics of perfect crystalline solids.' Choice