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.

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 ) ( 903,795 6,760,386 " 14,2341 5. Julian " 35 5 I 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 50,378,955376,834,379

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 who showed some veins to a few soldiers who girl

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."