FRÈRES PONTIFES, or Pontist Brothers, 296, and _footnote_. St. Bénézet was one of the leaders of this order. It is worth noting that some lay brotherhoods in England, animated by the religious spirit, repaired roads and bridges, like the Gild of the Holy Cross in Birmingham, which was founded under Richard the Second. There were similar gilds at Rochester and Bristol and Ludlow, etc. For information on “English Gilds,” see Toulmin Smith. FROGGALL BRIDGE, its angular recesses for the safety of foot-passengers, 258 _footnote_. FUENTES DE OÑORO, its slab-bridges akin to our Dartmoor “Clappers,” 104-5. GABLED BRIDGES, 27, 28, and _footnote_; Chinese, 248, 312, 365-6. GABRIEL, a French engineer, tried to revive the Roman and mediæval use of abutment piers, 339 _footnote_. GADDI, TADDEO, the reputed designer of the Ponte Vecchio at Florence, 222. GALLERIES, COVERED, in Persian Bridges, 214, 215, 270. GAOL, the chapel on the bridge at Bradford-on-Avon became a gaol, 232; also the one on Bedford Bridge, 231; a gaol stood at the east side of the Ouse Bridge at York, 243, and _footnote_. GARD, PONT DU, the famous Roman aqueduct, 83, 167-75, 321. GARDENS, SOME, on Old London Bridge, 219. GARIBALDI, when he marched to Rome the Ponte Salaro was blown up, 192. GARSTANG BRIDGE, a steep Lancashire bridge built in 1490, 250 _footnote_. GATEHOUSE, on the defensive bridge at Sospel, 276; on the thirteenth-century bridge at Narni, 277. GATEWAYS, DEFENSIVE, 208, 315. GATEWAY TOWERS, 97, 272, 278, 280, 286, 289, 323; see also the Lists of Illustrations. GAULISH BRIDGES, 70, 71. GAUTHEY, EMILAND, historian of bridges, 126-7, 191, 197, 199, 314, 322. GEBEL BARKEL, TWO PYRAMIDS AT, have arched porticoes built with voussoirs, 160. GENIUS, the motive-power of progress, 56, 59; her work usually weakened by the opposition of custom and convention, 59; she is a single creative agent with a double sex, 58; ordinary men have been of but little worth until genius has taken control of them, 239; her warfare against the stupidity of mankind, 110 _et seq._; see also “Mother-Ideas.” GENIUS, THE ENGLISH, is often inferior to the French genius in architecture, 294-5. GENIUS, THE ROMAN, 167-204. GERMANY, some of her old bridges, 259, 260; her creed of aggressive war, 33 _footnote_, 350, 359, 360, 361. GERONA, FAMOUS GABLED BRIDGE AT, 28, 29. GHENT, THE RABOT AT, a fortified bridge and lock, 289, 290, 291. GIGNAC, PONT DE, famous bridge of the 18th century, 310. GIPSY’S CARAVAN, how it stuck fast under the low tower at the entrance of Warkworth Bridge, 261, 262.