Frontinus, a man of consular dignity, and who had the direction of the Aqueducts under the Emperor Nerva, mentions nine. From other accounts we are informed that nine great Aqueducts existed at Rome at the commencement of the reign of Nerva. Five others were constructed by that Emperor, under the superintendence of Julius Frontinus; and it appears that at a later period the number amounted to twenty. Frontinus, who had the superintendence of the Roman Aqueducts under the Emperor Nerva, died A. D. 101. He gave an account of the Aqueducts, which has since been translated into French by Rondolet. The following table is made up of data from that work. The table is arranged to show, _First_, the name of the water or Aqueduct; _Second_, the era of its construction; _Third_, the length of each Aqueduct in miles and decimals; _Fourth_, the cubic feet discharged in 24 hours, and _Fifth_, the gallons in wine measure. +--------------------+-----------+---------+------------+------------+ | | | | | | | NAME. | ERA. | LENGTH. | CUBIC FEET.| GALLONS. | | | | | | | +--------------------+-----------+---------+------------+------------+ |1. Appian Aqueduct, | B.C. 312 | 10,3250| 3,706,575| 27,724,181| |2. Old Anio „ | „ 273 | 36,6775| 8,932,338| 66,813,887| |3. Marcian „ | „ 146 | 56,9417| 9,525,390| 71,249,917| |4. Tepulan „ | „ 127 }| 14,2341| { 903,795| 6,760,386| |5. Julian „ | „ 35 }| | { 2,449,386| 18,321,407| |6. Virgin „ | „ 22 | 14,3116| 5,085,624| 38,040,467| |7. Alsietina „ | A.D. 14 | 20,4526| 796,152| 5,656,016| |8. Claudian „ | „ 49 | 42,1989| 9,356,817| 96,988,991| |9. New Anio „ | „ 90 | 54,1644| 9,622,878| 71,979,127| | | |---------+------------+------------+ | | | 249,3058| 50,378,955 | 376,834,379| +--------------------+-----------+---------+------------+------------+ Some auxiliary supplies or feeders make the total length of the Roman Aqueducts, at that period, exceed 255 miles. The names of the Roman Aqueducts are taken from those of the River or Lake which supplies them, or from the emperors who caused them to be constructed. Frontinus gives the following as the origin of the name _Virgin Aqueduct_: “It is called the Virgin (Virgo), because it was a young girl who showed some veins to a few soldiers who were in search of spring water. Those who dug followed these veins and found a great quantity, and there is a painting in a little temple erected close by the source representing this event.” SOME OF THE PRINCIPAL AQUEDUCTS CONSTRUCTED BY THE ANCIENT ROMANS IN OTHER PARTS OF EUROPE. _Aqueduct of Nismes._