It is here impossible that they could have fallen down in an earthquake, as was the case in the Colosseum. A garden was made here upon the arena, and these decorations were removed from the surface, as interfering with the cultivation of the garden, and thrown down into the substructures, and then arranged under the vault as we see them. THE COLOSSEUM. PLATE XXXVI. PLAN OF THE GREAT DRAIN. [Illustration: COLOSSEUM—PLAN OF THE GREAT DRAIN] DESCRIPTION OF PLATE XXXVI. PLAN OF THE GREAT DRAIN. A. The Colosseum. B. Part of the Cœlian Hill, on which the Claudium stood. C. Part of the Palatine Hill. a. Summa Sacra Via. a*. Clivus Triumphalis. b. Meta Sudans. c. Arch of Constantine. d d. Passage of Commodus. e. Site on which the steam-engine was placed in 1874-5, to pump out the water coming from this point. f. Piscina of the time of Nero. g. Castellum Aquæ, or reservoir of Alexander Severus. g*. Aqueduct of the third century. h h. Exhedra of the Ludus Magnus. i i i. Great Drain of the Colosseum, to convey the water to the Tiber. k. The exact spot where the water runs down from the Cœlian into the Colosseum, called a natural spring, but not having the usual bubbling character of a spring. l. Via di S. Giovanni in Laterano. m. Via Cœlimontana. n n n. Orto Botanico. Waste ground at the foot of the Cœlian Hill, planted with trees and shrubs, _called_ the Botanical Garden, but not used as such. o o. Via del Arco di Constantino. The road between the Cœlian and the Palatine Hill. p. Podium of the colossal statue of Gordianus, 50 ft. high. FOOTNOTES [1] See Plate XIII. [2] Ibid. XVII., XVIII. [3] See Plates V., VI. [4] See Plate XVI. [5] Ibid. XXII. [6] Ibid. XXIII. [7] Ibid. XXIV., XXV. [8] Ibid. X. [9] Ibid. IX., XV. [10] See Plate IV. [11] Ibid. XV. [12] Ibid. I., II. [13] See Plate XII. [14] Ibid. XI. [15] Ibid. XX., XXI. [16] Ibid. XIV. [17] Ibid. VII., VIII., XXVI. [18] Ibid. XIX. [19] Ibid. XXXVI. [20] See Plates XXVII., XXVIII., XXIX., XXX., XXXI. [21] Ibid. XXXII., XXXIII., XXXIV., XXXV. [22] See the Part of this work on the Forum Romanum and the Via Sacra for evidence of this. [23] “Fecit et nova opera ... item amphitheatrum urbe media, ut destinasse compererat Augustum.” (Suetonius, Vespasianus, c. 9.) [24] Plinii Nat. Hist., lib. xxxvi. c. 24, s. 8. [25] Dionis Hist., lib. xliii. c. 25.