PREFACE.- PART ONE: AN OVERVIEW.- KEY POINTS SUMMARIZED.- BASIC PRINCIPLES IN ACTION.- A FIRST ACQUAINTANCE WITH CONDENSED MATTER.- PART TWO: TWO SIMPLE MODELS FOR SOLIDS.- THE JELLIUM MODEL AND METALS, I.- THE JELLIUM MODEL AND METALS, II.- SOLIDS AS SUPERGIANT MOLECULES: LCAO.- SEMICONDUCTORS AND OTHER TETRAVALENT SOLIDS.- BEYOND THE JM AND LCAO: AN OUTLINE.- PART THREE: MORE ABOUT PERIODICITY & ITS CONSEQUENCES.- CRYSTAL STRUCTURE AND IONIC VIBRATIONS.- ELECTRONS IN PERIODIC MEDIA: RESPONSE IN THE PRESENCE OF A STATIC MAGNETIC FIELD.- CALCULATING THE BAND STRUCTURE.- PSEUDOPOTENTIALS IN 1d AND 2d MODELS.- PART FOUR: MATERIALS.- CLOSED - SHELL SOLIDS.- SEMICONDUCTORS REVISITED.- SIMPLE METALS REVISITED.- TRANSITION METALS AND COMPOUNDS.- ARTIFICIAL PERIODIC STRUCTURES.- PART FIVE: DEVIATIONS FROM PERIODICITY.- POINT DEFECTS REVISITED.- SURFACES & INTERFACES.- FINITE SYSTEMS.- NON - PERIODIC MATERIALS.- DISORDER & ELECTRONIC PROPERTIES.- PART SIX: CORRELATED SYSTEMS.- MAGNETIC MATERIAL.- SUPERCONDUCTIVITY