257. The Municipal Superintendents and Commissioners (_Curatores_) 301 258. Excellent Water Supply of Rome 301 259. The Great Aqueducts 303 260. The Police System Instituted by Augustus 304 261. The Police-Firemen of the Watch (_Vigiles_). The _Præfectus Vigilum_ 304 Chapter XVI. The Prætorian Camp. The Imperial War Machine 262. The Army the Real Master of the Roman Empire 307 263. Army Held under Stiff Discipline and Concentrated on Frontiers 308 264. The Prætorian Guard of the Emperors 309 265. The Prætorian Præfect and the Prætorian Camp 311 266. Organization and Discipline of the Prætorians 312 267. The City Cohorts (_Cohortes Urbanæ_) 313 268. A Private in the Legions. The Legionary Organization 314 269. Training of the Legionaries: the _Pilum_ and the _Gladius_ 316 270. Defensive Weapons 318 271. Rewards and Punishments for Soldiers 319 272. Pay and Rations in the Army: Soldiers’ Saving Banks 320 273. The Training of Soldiers: Non-Military Labors 321 274. Petty Officers in the Legions 322 275. The Centurions: Their Importance and Order of Promotion 323 276. The _Primipilus_: the Great Eagle of the Legion 325 277. Locations and Names of Legions 326 278. The Auxiliary Cohorts: the Second Grand Division of the Army 327 279. The Præfect of the Camps and the Legate of the Legion 328 280. Care for Veterans: Retiring Bonuses and Land Grants 329 281. Barrier Fortresses; System of Encampments; Flexible Battle Tactics; Siege Warfare 330 282. Limited Size of the Imperial Army: Its Great Efficiency 331 Chapter XVII. The Senate: A Session and a Debate 283. Apparent Authority and Importance of the Senate 334 284. Actual Weakness of the Senate 335 285. Amount of Power Left to the Senate 336 286. Organization and Procedure of the Senate 337 287. The _Curia_ (Senate House) and Its Arrangement of Benches 338