The Ethiopic syllabary employed for writing the classical Ge'ez and also, with certain modifications, the contemporary South Semitic vernaculars of East Africa, was formed by super-imposing a system of auxiliary vowel-marks upon a basic consonantal alphabet; this alphabet occurs, alongside of the syllabic script, in the Old Ethiopic inscriptions of the Axumite Kingdom in the fourth century of our era, and is a derivative of the Sabaeo-Minaean or Old South Arabic script found in the monuments of the south-west Arabian kingdoms. But although the Ethiopic syllabary is thus genetically connected with the other main branches of the Semitic alphabet, the traditional order of the signs, in which the consonantal component and the accompanying vowel are the primary and secondary determining factors respectively, does not agree with that of any Semitic alphabet hitherto known. There is no old or reliable native tradition as to the reason underlying the order of the signs; no help is to be had from numerical signs, which elsewhere, as will shortly appear, afford valuable testimony to the order of the letters; for Ethiopic borrowed Greek alphabetic signs for this purpose, while the South Arabian inscriptions used single strokes for the units, and for higher denominations the initial letters of the native words for five, ten, hundred, &c. The mnemonic word-groups reconstructed by Bauer and others are open to objection on grounds of language and sense. Other external criteria yield only tentative and inconclusive results, and the subject has accordingly remained one of speculation and controversy.