1. THE INFLUENCE OF THE CUPOLA UPON SO-CALLED GOTHIC ARCHITECTURE 11 2. THE ORIGIN OF THE INTERSECTING ARCH 16 3. THE FIRST VAULTS ON INTERSECTING ARCHES 24 4. BUILDINGS VAULTED ON INTERSECTING ARCHES 32 5. THE ORIGIN OF THE FLYING BUTTRESS 41 6. CHURCHES AND CATHEDRALS OF THE TWELFTH AND FOURTEENTH CENTURIES 51 7. CATHEDRALS OF THE THIRTEENTH CENTURY 67 8. CATHEDRALS AND CHURCHES FROM THE TWELFTH TO THE FOURTEENTH CENTURY 85 9. CHURCHES OF THE FOURTEENTH AND FIFTEENTH CENTURIES IN FRANCE AND IN THE EAST 105 10. TOWERS AND BELFRIES--CHOIRS--CHAPELS 128 11. SCULPTURE 153 12. PAINTING 179 PART II MONASTIC ARCHITECTURE CHAP. PAGE 1. ORIGIN 205 2. ABBEYS OF CLUNY, CITEAUX, AND CLAIRVAUX 215 3. ABBEYS AND _CHARTREUSES_ OR CARTHUSIAN MONASTERIES 227 4. FORTIFIED ABBEYS 247 PART III MILITARY ARCHITECTURE 1. RAMPARTS OF TOWNS 269 2. CASTLES AND KEEPS 291 3. GATES AND BRIDGES 309 PART IV CIVIL ARCHITECTURE 1. BARNS, HOSPITALS, HOUSES, AND "HÔTELS" OR TOWNHOUSES OF THE NOBILITY 333 2. TOWN-HALLS, BELFRIES, AND PALACES 360 ILLUSTRATIONS Canterbury Cathedral. By A. Brunet-Debaines _Frontispiece_ FIG. PAGE 1. Plan of a cupola of the Abbey Church of St. Front at Périgueux 17 2. Pendentive of a cupola of the Abbey Church of St. Front at Périgueux 18 3. Diagonal section of a pendentive 19 4. Plan of a cupola of Angoulême or Fontevrault 20 5. Section of a bay of the cupolas of Angoulême 20 6. Section of a bay in the Church of St. Avit-Sénieur 21