Arcade on the Cœlian ib. Reservoir over the Arch of Dolabella 67 Three branches from that high reservoir: 1. to the Claudium and the Colosseum; 2. to the Palatine and Capitol; 3. to the Aventine, over the Porta Capena ib. Smaller reservoirs for subdividing 68 Rebuildings by Frontinus under Trajan ib. Springs called _Cæruleus_ and _Curtius_ 69 The _Piscinæ_ 70 Appendix—The Nine Aqueducts of Frontinus 71 Tables of Dates, Names, Levels, Length of Channel, Supply, Distribution 73, 74 Calculations 74-79 The Curator Aquarum 80 Repairs by the Popes ib. Popular notions erroneous 81 These stone _specus_ necessary for the main stream, and leaden pipes for distribution 82 Brass cocks and leaden pipes often stolen, as mentioned in a letter of King Theodoric ib. X. SABATINA, TRAJANA, A.D. 110, AND PAOLA, A.D. 1540. Lacus Sabatina, di Bracciano, or Anguillara 83 This aqueduct connected with the Alsietina (VII.) ib. The line traced backwards by the respirators from the terminus on the Janiculum ib. Procopius amazed at the quantity of water brought by this aqueduct in the sixth century ib. Restorations of the Popes 84 Inscriptions of Paul V. ib. Cascade on the Janiculum, turns the wheels of the flour-mills ib. _Specus_ in the wall of the garden of the Villa Pamphili-Doria 85 —— but chiefly underground, traced by the respirators ib. XI. TRAJANA (?), HADRIANA (?), ALEXANDRINA (?). Passage from Frontinus 86 Sources near Gabii and Labicum, now La Colonna ib. Several springs were collected in a central reservoir, on which an inscription of Hadrian was found by E. Q. Visconti ib. One of these springs had petrifying qualities ib. Singular effects of the petrifying stream 87 _Specus_ choked up with stalactite, and cascades petrified ib.