_p._ 100, _line_ 2. from the Aqua The Aqua Algentiana really comes Marcia. from Mons Algidus, near Tusculum. _p._ 106, _line_ 19. _fistula the fistula Urbana is of lead, not Urbana_, made in a piece of marble. marble. _p._ 110. (xi.) Alseatina. Alsietina. _p._ 118, _line_ 33. Garciano. Carciano. _p._ 121, _line_ 33, _col._ 2. Torre de’ Schiavi. Torre d’ Scavi. _p._ 122. (vii.) ALSEATINA. ALSIETINA. _Ibid._ Cariæ. Careiæ. _p._ 132, _line_ 6. Alseatina. Alsietina. _Ibid._ Pantana. Pantano. LEVELS OF THE AQUEDUCTS, TAKEN BY ERNEST DE MAURO, 1871. THE SEVEN SPECUS AT THE PORTA MAGGIORE, ARRANGED ACCORDING TO THE LEVELS ABOVE THE SEA. I. Anio Novus, 65.000. II. Claudia, 62.336. The _specus_ at the Trophies of Marius, 59.936. III. Felice, 59.560. _Specus_ on the high ground, between the Porta Maggiore and S. Lorenzo, 59.100. Reservoir at the fountain of Termini, 58.600. IV. Julia, 58.192. Reservoir behind the wall near the Porta S. Lorenzo, 53.000. V. Tepula, 56.712. Reservoir in the wall near the Porta S. Lorenzo, 49.525. VI. Marcia, 54.788. _Specus_ at the Porta S. Lorenzo, 54.405. VII. Anio Vetus, 45.688. Reservoir near Porta Furba, two miles from the Porta Maggiore, 47.193. Reservoir in the Vigna Berardi, 41.731[216]. Reservoir between the Porta Asinaria and the Amphitheatrum Castrense, 34.030. Reservoir in the Vigna Mangani, near the Minerva Medica, 47.735. Two small _specus_ in the Via Labicana, 43.857[217]. Antoniana—_Specus_ in the City wall and over the Arch of Drusus, 40.374. Aurelia—Reservoir on the south side of the Porta Latina, 36.000. Severiana (?)—Reservoir on the north side of the Porta Latina, 33.400. Aqua Marcia Pia[218], 60.088, at the Porta Pia. HISTORICAL PHOTOGRAPHS OF THE AQUEDUCTS. [_The numbers refer to Mr. Parker’s Catalogue._] _Those marked with * are from drawings, valuable for historical purposes_, but not as photographs. In his admirable treatise on the Aqueducts, Frontinus mentions in his first book, as an introduction, that before they were made, the Roman people, for the space of 441 years after the foundation of the City, were content with the water from the Tiber and from certain natural springs which from their salubrity were supposed to be sanctified.