[220] There is a large and deep reservoir for it near the arch of Dolabella, under the garden of the Villa Mattei, now called the Villa Cœlimontana, and from thence it passed, still underground, to the cliff of the Cœlian, opposite to the Aventine. A short tunnel was made from this deep reservoir to a Nymphæum under the Cœlian, now S. Stefano Rotondo, called of Septimius Severus. The ruins of it are shewn in 895; a _specus_ has been traced from one to the other. [221] See Frontinus de Aqueductibus, c. 6. [222] Ibid., c. 125, and 93. [223] Frontinus de Aqueductibus, c. 6. [224] Frontinus, c. 125. [225] Ibid., c. 93. [226] They remind English people of the Clapham Junction of the railways near London, where trains crossing each other at different levels can be seen. [227] Supra Portam Capenam, F. i. 19. [228] See Frontinus de Aqueductibus, caps. 11, 18, 22, and 71. [229] Frontinus de Aqueductibus, cap. 13, 14, 18, 20. [230] Cohen. Méd. Imp. Alex. Sev., (Nos. 239, 334). [231] This water is not mentioned in the Regionary Catalogue, and its whole history appears doubtful. Some think the name is a corruption of Argentina, the short stream that rises in the Lupercal or Wolf’s Cave, under the north-west corner of the Palatine, as before mentioned. [232] These sources are on the cliffs above the river Anio, at from five seven miles from Rome, and two miles from Ponte Nono, in swampy meadows called “the meadows of Lucullus,” and some in old stone quarries. [233] See also the Photo-engravings, Plates I. and II.; and Historical Photographs, Nos. 865, 866, 867. [234] See page 3, and Historical Photographs, Nos. 632, 710, 1138, 1139, 1140, 1141, 1142, 1253; and Plates X. and XI. of the Supplement to Part I. [235] See Photos., Nos. 1116 and 889. [236] This is now, in 1876, taken possession of by the British and American Archæological Society, with the consent of the owner of the ground, who has allowed a door to be put up at the entrance. [237] See also Plate XX. [238] This map is to be had on either of these two larger scales, for those who require more minute information. [239] See p. 3. [240] See p. 13. [241] See p. 32. [242] See p. 46. [243] See p. 39. [244] See p. 41. [245] See p. 92. [246] See p. 55. [247] See p. 54. [248] See p. 86. [249] See p. 92. [250] See p. 97. [251] See p. 100. [252] See p. 106. [253] See No. VII., p. 50. THE AQUEDUCTS OF ANCIENT ROME, TRACED FROM THEIR SOURCES TO THEIR MOUTHS, CHIEFLY BY THE WORK OF FRONTINUS; VERIFIED BY A SURVEY OF THE GROUND. BY JOHN HENRY PARKER, C.B. HON. M.A. OXON., F.S.A. LOND., &c. AND ASSISTANTS.