We are obliged very seriously to weigh the possibility that the South-Semitic alphabet is descended, not from the Mesha [Moabite] alphabet or from some only slightly different and slightly older script, but rather from a much older script now unknown to us—a script which must in essentials have exhibited an alphabetic character. On this view the uniformity which the letters of the South-Semitic alphabet display among themselves, in strong contrast to the wholly different Phoenician alphabet, would find its explanation in the fact that the South-Semitic and the Phoenician alphabets were very ancient bifurcations from a script still plastic and not yet reduced to uniformity. A further inference to be drawn would be this, that very possibly the intermediate stages between the Mesha alphabet and the South-Semitic may now have completely disappeared.1

1 Quoted by Gardiner, A. H., "The Egyptian Origin of the Semitic Alphabet," ., 3: 4–5.