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logers are far from being .agreed about the precise time atwhich the Olympiads began, some dating them from the vic-tory of Coroebus the Elean, and others throwing their origi-nal thirteen, and even twenty-eight, Olympiads further back-ward. This was done by artificial chronologers, who, inorder to accommodate the Olympiads to their systems andcomputations, have, as Sir Isaac Newton observes, added totheir antiquity one hundred and twelve years. Chronologers,however, in all their computations, agree to reckon down-ward from that Olympiad, in which Coroebus the Elean wasconqueror: the first year of which was the 776th B. C.,answering to the Julian Period of 3938.

The Epocha of the Building of Rome , or Urbi$ Condi ta,U.C., according to Varro , whose opinion was adopted by theRoman Emperors in their proclamations, and the classicalwriters in general, and by most modern chronologers, com-menced on the 20th of April, in the year of the JulianPeriod, 3961, or 753 B. C. Sir Isaac Newton , however,states that Rome was built in the fifteenth age after thedestruction of Troy, which took place 904 B. C., and allow-ing twenty-one years to each of the fourteen kings whoreigned in Alba, previous to the building of Rome , it wouldbring forward that Epoch to the thirty-eighth Olympiad, or•637 B. C.

The Epocha of Nabonatsar, King of Babylon, used byHipparchus , Ptolemy and others, commenced on the 26thFeb. 747 B. C.

The author of the Vulgar or Christian /Era, being themethod of computation adopted by Christians in general, wasDionysius, by birth a Scythian , and Abbot of Rome , A. D.507 j he began his account from the Conception or Incarna-tion, by us popularly called Lady-day or the Annunciation,which he stated to have happened in the year 4713 of theJulian Period: heforc his time the Christians usually com-puted their years either from the Building of Rome , or