The work of Aristeides is perhaps the most valuable of all the ancient musical treatises. It embraces, besides the theory of music (ἁρμονική) in the modern sense, the whole range of subjects comprehended under μουσική, which latter science contemplated not merely the regulation of sounds, but the harmonious disposition of everything in nature. The first book treats of Harmonics and Rhythm; the former subject being considered under the usual heads of Sounds, Intervals, Systems, Genera, Modes, Transition, and Composition (μελοποιΐα). The second, of the moral effects and educational powers of music; and the third of the numerical ratios which define musical intervals, and of their connexion with physical and moral science generally.
William Smith. A Dictionary of Greek and Roman biography and mythology. London. John Murray: printed by Spottiswoode and Co., New-Street Square and Parliament Street. In the article on Soranus, we find: "at this present time (1848)" and this date seems to reflect the dates of works cited. 1873 - probably the printing date.
